tests: `hg init` after resetting HGRCPATH

Otherwise extensions loaded via --extra-config-opt could prevent
access to the repo by introducing requirements file. This does mean
that custom extensions loaded in this way won't impact this test.
I'm fine with that.

Differential Revision: https://phab.mercurial-scm.org/D3115

tests/test-hgrc.t

@@ -1,249 +1,249 b''
-hide outer repo
-  $ hg init
-
 Use hgrc within $TESTTMP
 
   $ HGRCPATH=`pwd`/hgrc
   $ export HGRCPATH
 
+hide outer repo
+  $ hg init
+
 Use an alternate var for scribbling on hgrc to keep check-code from
 complaining about the important settings we may be overwriting:
 
   $ HGRC=`pwd`/hgrc
   $ export HGRC
 
 Basic syntax error
 
   $ echo "invalid" > $HGRC
   $ hg version
   hg: parse error at $TESTTMP/hgrc:1: invalid
   [255]
   $ echo "" > $HGRC
 
 Issue1199: Can't use '%' in hgrc (eg url encoded username)
 
   $ hg init "foo%bar"
   $ hg clone "foo%bar" foobar
   updating to branch default
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd foobar
   $ cat .hg/hgrc
   # example repository config (see 'hg help config' for more info)
   [paths]
   default = $TESTTMP/foo%bar
   
   # path aliases to other clones of this repo in URLs or filesystem paths
   # (see 'hg help config.paths' for more info)
   #
   # default:pushurl = ssh://[e-mail]/hg/jdoes-fork
   # my-fork         = ssh://[e-mail]/hg/jdoes-fork
   # my-clone        = /home/jdoe/jdoes-clone
   
   [ui]
   # name and email (local to this repository, optional), e.g.
   # username = Jane Doe <[e-mail]>
   $ hg paths
   default = $TESTTMP/foo%bar
   $ hg showconfig
   bundle.mainreporoot=$TESTTMP/foobar
   paths.default=$TESTTMP/foo%bar
   $ cd ..
 
 issue1829: wrong indentation
 
   $ echo '[foo]' > $HGRC
   $ echo '  x = y' >> $HGRC
   $ hg version
   hg: parse error at $TESTTMP/hgrc:2:   x = y
   unexpected leading whitespace
   [255]
 
   $ $PYTHON -c "from __future__ import print_function; print('[foo]\nbar = a\n b\n c \n  de\n fg \nbaz = bif cb \n')" \
   > > $HGRC
   $ hg showconfig foo
   foo.bar=a\nb\nc\nde\nfg
   foo.baz=bif cb
 
   $ FAKEPATH=/path/to/nowhere
   $ export FAKEPATH
   $ echo '%include $FAKEPATH/no-such-file' > $HGRC
   $ hg version
   Mercurial Distributed SCM (version *) (glob)
   (see https://mercurial-scm.org for more information)
   
   Copyright (C) 2005-* Matt Mackall and others (glob)
   This is free software; see the source for copying conditions. There is NO
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   $ unset FAKEPATH
 
 make sure global options given on the cmdline take precedence
 
   $ hg showconfig --config ui.verbose=True --quiet
   bundle.mainreporoot=$TESTTMP
   ui.verbose=False
   ui.debug=False
   ui.quiet=True
 
   $ touch foobar/untracked
   $ cat >> foobar/.hg/hgrc <<EOF
   > [ui]
   > verbose=True
   > EOF
   $ hg -R foobar st -q
 
 username expansion
 
   $ olduser=$HGUSER
   $ unset HGUSER
 
   $ FAKEUSER='John Doe'
   $ export FAKEUSER
   $ echo '[ui]' > $HGRC
   $ echo 'username = $FAKEUSER' >> $HGRC
 
   $ hg init usertest
   $ cd usertest
   $ touch bar
   $ hg commit --addremove --quiet -m "added bar"
   $ hg log --template "{author}\n"
   John Doe
   $ cd ..
 
   $ hg showconfig
   bundle.mainreporoot=$TESTTMP
   ui.username=$FAKEUSER
 
   $ unset FAKEUSER
   $ HGUSER=$olduser
   $ export HGUSER
 
 showconfig with multiple arguments
 
   $ echo "[alias]" > $HGRC
   $ echo "log = log -g" >> $HGRC
   $ echo "[defaults]" >> $HGRC
   $ echo "identify = -n" >> $HGRC
   $ hg showconfig alias defaults
   alias.log=log -g
   defaults.identify=-n
   $ hg showconfig alias alias
   alias.log=log -g
   $ hg showconfig alias.log alias.log
   alias.log=log -g
   $ hg showconfig alias defaults.identify
   alias.log=log -g
   defaults.identify=-n
   $ hg showconfig alias.log defaults.identify
   alias.log=log -g
   defaults.identify=-n
 
 HGPLAIN
 
   $ echo "[ui]" > $HGRC
   $ echo "debug=true" >> $HGRC
   $ echo "fallbackencoding=ASCII" >> $HGRC
   $ echo "quiet=true" >> $HGRC
   $ echo "slash=true" >> $HGRC
   $ echo "traceback=true" >> $HGRC
   $ echo "verbose=true" >> $HGRC
   $ echo "style=~/.hgstyle" >> $HGRC
   $ echo "logtemplate={node}" >> $HGRC
   $ echo "[defaults]" >> $HGRC
   $ echo "identify=-n" >> $HGRC
   $ echo "[alias]" >> $HGRC
   $ echo "log=log -g" >> $HGRC
 
 customized hgrc
 
   $ hg showconfig
   read config from: $TESTTMP/hgrc
   $TESTTMP/hgrc:13: alias.log=log -g
   repo: bundle.mainreporoot=$TESTTMP
   $TESTTMP/hgrc:11: defaults.identify=-n
   $TESTTMP/hgrc:2: ui.debug=true
   $TESTTMP/hgrc:3: ui.fallbackencoding=ASCII
   $TESTTMP/hgrc:4: ui.quiet=true
   $TESTTMP/hgrc:5: ui.slash=true
   $TESTTMP/hgrc:6: ui.traceback=true
   $TESTTMP/hgrc:7: ui.verbose=true
   $TESTTMP/hgrc:8: ui.style=~/.hgstyle
   $TESTTMP/hgrc:9: ui.logtemplate={node}
 
 plain hgrc
 
   $ HGPLAIN=; export HGPLAIN
   $ hg showconfig --config ui.traceback=True --debug
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   --config: ui.traceback=True
   --verbose: ui.verbose=False
   --debug: ui.debug=True
   --quiet: ui.quiet=False
 
 with environment variables
 
   $ PAGER=p1 EDITOR=e1 VISUAL=e2 hg showconfig --debug
   set config by: $EDITOR
   set config by: $VISUAL
   set config by: $PAGER
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   $PAGER: pager.pager=p1
   $VISUAL: ui.editor=e2
   --verbose: ui.verbose=False
   --debug: ui.debug=True
   --quiet: ui.quiet=False
 
 plain mode with exceptions
 
   $ cat > plain.py <<EOF
   > from mercurial import commands, extensions
   > def _config(orig, ui, repo, *values, **opts):
   >     ui.write('plain: %r\n' % ui.plain())
   >     return orig(ui, repo, *values, **opts)
   > def uisetup(ui):
   >     extensions.wrapcommand(commands.table, 'config', _config)
   > EOF
   $ echo "[extensions]" >> $HGRC
   $ echo "plain=./plain.py" >> $HGRC
   $ HGPLAINEXCEPT=; export HGPLAINEXCEPT
   $ hg showconfig --config ui.traceback=True --debug
   plain: True
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   $TESTTMP/hgrc:15: extensions.plain=./plain.py
   --config: ui.traceback=True
   --verbose: ui.verbose=False
   --debug: ui.debug=True
   --quiet: ui.quiet=False
   $ unset HGPLAIN
   $ hg showconfig --config ui.traceback=True --debug
   plain: True
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   $TESTTMP/hgrc:15: extensions.plain=./plain.py
   --config: ui.traceback=True
   --verbose: ui.verbose=False
   --debug: ui.debug=True
   --quiet: ui.quiet=False
   $ HGPLAINEXCEPT=i18n; export HGPLAINEXCEPT
   $ hg showconfig --config ui.traceback=True --debug
   plain: True
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   $TESTTMP/hgrc:15: extensions.plain=./plain.py
   --config: ui.traceback=True
   --verbose: ui.verbose=False
   --debug: ui.debug=True
   --quiet: ui.quiet=False
 
 source of paths is not mangled
 
   $ cat >> $HGRCPATH <<EOF
   > [paths]
   > foo = bar
   > EOF
   $ hg showconfig --debug paths
   plain: True
   read config from: $TESTTMP/hgrc
   $TESTTMP/hgrc:17: paths.foo=$TESTTMP/bar