py3: use python3 hg in test-py3-commands.t at places where py2 hg was used

This patch fixes my mistakes where I added test in test-py3-commands.t as
`hg ...` where I forgot hg here refers to Python 2 mercurial.

tests/test-py3-commands.t

@@ -1,231 +1,231 b''
 #require py3exe
 
 This test helps in keeping a track on which commands we can run on
 Python 3 and see what kind of errors are coming up.
 The full traceback is hidden to have a stable output.
   $ HGBIN=`which hg`
 
   $ for cmd in version debuginstall ; do
   >   echo $cmd
   >   $PYTHON3 $HGBIN $cmd 2>&1 2>&1 | tail -1
   > done
   version
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   debuginstall
   no problems detected
 
 #if test-repo
 Make a clone so that any features in the developer's .hg/hgrc that
 might confuse Python 3 don't break this test. When we can do commit in
 Python 3, we'll stop doing this. We use e76ed1e480ef for the clone
 because it has different files than 273ce12ad8f1, so we can test both
 `files` from dirstate and `files` loaded from a specific revision.
 
   $ hg clone -r e76ed1e480ef "`dirname "$TESTDIR"`" testrepo 2>&1 | tail -1
   15 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
 Test using -R, which exercises some URL code:
   $ $PYTHON3 $HGBIN -R testrepo files -r 273ce12ad8f1 | tail -1
   testrepo/tkmerge
 
 Now prove `hg files` is reading the whole manifest. We have to grep
 out some potential warnings that come from hgrc as yet.
   $ cd testrepo
   $ $PYTHON3 $HGBIN files -r 273ce12ad8f1
   .hgignore
   PKG-INFO
   README
   hg
   mercurial/__init__.py
   mercurial/byterange.py
   mercurial/fancyopts.py
   mercurial/hg.py
   mercurial/mdiff.py
   mercurial/revlog.py
   mercurial/transaction.py
   notes.txt
   setup.py
   tkmerge
 
   $ $PYTHON3 $HGBIN files -r 273ce12ad8f1 | wc -l
   \s*14 (re)
   $ $PYTHON3 $HGBIN files | wc -l
   \s*15 (re)
 
 Test if log-like commands work:
 
   $ $PYTHON3 $HGBIN tip
   changeset:   10:e76ed1e480ef
   tag:         tip
   user:        [e-mail]
   date:        Tue May 03 23:37:43 2005 -0800
   summary:     Fix linking of changeset revs when merging
   
 
   $ $PYTHON3 $HGBIN log -r0
   changeset:   0:9117c6561b0b
   user:        [e-mail]
   date:        Tue May 03 13:16:10 2005 -0800
   summary:     Add back links from file revisions to changeset revisions
   
 
   $ cd ..
 #endif
 
 Test if `hg config` works:
 
   $ $PYTHON3 $HGBIN config
   devel.all-warnings=true
   devel.default-date=0 0
   largefiles.usercache=$TESTTMP/.cache/largefiles
   ui.slash=True
   ui.interactive=False
   ui.mergemarkers=detailed
   ui.promptecho=True
   web.address=localhost
   web.ipv6=False
 
   $ cat > included-hgrc <<EOF
   > [extensions]
   > babar = imaginary_elephant
   > EOF
   $ cat >> $HGRCPATH <<EOF
   > %include $TESTTMP/included-hgrc
   > EOF
   $ $PYTHON3 $HGBIN version | tail -1
   *** failed to import extension babar from imaginary_elephant: *: 'imaginary_elephant' (glob)
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
   $ rm included-hgrc
   $ touch included-hgrc
 
 Test bytes-ness of policy.policy with HGMODULEPOLICY
 
   $ HGMODULEPOLICY=py
   $ export HGMODULEPOLICY
   $ $PYTHON3 `which hg` debuginstall 2>&1 2>&1 | tail -1
   no problems detected
 
 `hg init` can create empty repos
 `hg status works fine`
 `hg summary` also works!
 
   $ $PYTHON3 `which hg` init py3repo
   $ cd py3repo
   $ echo "This is the file 'iota'." > iota
   $ $PYTHON3 $HGBIN status
   ? iota
   $ $PYTHON3 $HGBIN add iota
   $ $PYTHON3 $HGBIN status
   A iota
   $ hg diff --nodates --git
   diff --git a/iota b/iota
   new file mode 100644
   --- /dev/null
   +++ b/iota
   @@ -0,0 +1,1 @@
   +This is the file 'iota'.
   $ $PYTHON3 $HGBIN commit --message 'commit performed in Python 3'
   $ $PYTHON3 $HGBIN status
 
   $ mkdir A
   $ echo "This is the file 'mu'." > A/mu
   $ $PYTHON3 $HGBIN addremove
   adding A/mu
   $ $PYTHON3 $HGBIN status
   A A/mu
   $ HGEDITOR='echo message > ' $PYTHON3 $HGBIN commit
   $ $PYTHON3 $HGBIN status
   $ $PYHON3 $HGBIN summary
   parent: 1:e1e9167203d4 tip
    message
   branch: default
   commit: (clean)
   update: (current)
   phases: 2 draft
 
 Test weird unicode-vs-bytes stuff
 
   $ $PYTHON3 $HGBIN help | egrep -v '^ |^$'
   Mercurial Distributed SCM
   list of commands:
   additional help topics:
   (use 'hg help -v' to show built-in aliases and global options)
 
   $ $PYTHON3 $HGBIN help help | egrep -v '^ |^$'
   hg help [-ecks] [TOPIC]
   show help for a given topic or a help overview
   options ([+] can be repeated):
   (some details hidden, use --verbose to show complete help)
 
   $ $PYTHON3 $HGBIN help -k notopic
   abort: no matches
   (try 'hg help' for a list of topics)
   [255]
 
 Prove the repo is valid using the Python 2 `hg`:
   $ hg verify
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   2 files, 2 changesets, 2 total revisions
   $ hg log
   changeset:   1:e1e9167203d4
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     message
   
   changeset:   0:71c96e924262
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     commit performed in Python 3
   
 
-  $ hg log -G
+  $ $PYTHON3 $HGBIN log -G
   @  changeset:   1:e1e9167203d4
   |  tag:         tip
   |  user:        test
   |  date:        Thu Jan 01 00:00:00 1970 +0000
   |  summary:     message
   |
   o  changeset:   0:71c96e924262
      user:        test
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     commit performed in Python 3
   
-  $ hg log -Tjson
+  $ $PYTHON3 $HGBIN log -Tjson
   [
    {
     "rev": 1,
     "node": "e1e9167203d450ca2f558af628955b5f5afd4489",
     "branch": "default",
     "phase": "draft",
     "user": "test",
     "date": [0, 0],
     "desc": "message",
     "bookmarks": [],
     "tags": ["tip"],
     "parents": ["71c96e924262969ff0d8d3d695b0f75412ccc3d8"]
    },
    {
     "rev": 0,
     "node": "71c96e924262969ff0d8d3d695b0f75412ccc3d8",
     "branch": "default",
     "phase": "draft",
     "user": "test",
     "date": [0, 0],
     "desc": "commit performed in Python 3",
     "bookmarks": [],
     "tags": [],
     "parents": ["0000000000000000000000000000000000000000"]
    }
   ]
 
 Show that update works now!
 
-  $ hg up 0
+  $ $PYTHON3 $HGBIN up 0
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
-  $ hg identify
+  $ $PYTHON3 $HGBIN identify
   71c96e924262