tests: make config/help tests pass even if chgserver extension is loaded

It isn't important for these tests if "extensions.chgserver=" is set or not.
So let's make them ignore such lines.

tests/test-basic.t

@@ -6,6 +6,7 b' Create a repository:'
   defaults.shelve=--date "0 0"
   defaults.tag=-d "0 0"
   devel.all-warnings=true
+  extensions.chgserver= (?)
   largefiles.usercache=$TESTTMP/.cache/largefiles (glob)
   ui.slash=True
   ui.interactive=False

tests/test-help.t

@@ -241,6 +241,7 b' Test extension help:'
   
       enabled extensions:
   
+       chgserver     command server extension for cHg (EXPERIMENTAL) (?)
        children      command to display child changesets (DEPRECATED)
        rebase        command to move sets of revisions to a different ancestor
   

tests/test-hgrc.t

@@ -46,6 +46,7 b" Issue1199: Can't use '%' in hgrc (eg url"
   default = $TESTTMP/foo%bar (glob)
   $ hg showconfig
   bundle.mainreporoot=$TESTTMP/foobar (glob)
+  extensions.chgserver= (?)
   paths.default=$TESTTMP/foo%bar (glob)
   $ cd ..
 
@@ -80,6 +81,7 b' make sure global options given on the cm'
 
   $ hg showconfig --config ui.verbose=True --quiet
   bundle.mainreporoot=$TESTTMP
+  extensions.chgserver= (?)
   ui.verbose=False
   ui.debug=False
   ui.quiet=True
@@ -111,6 +113,7 b' username expansion'
 
   $ hg showconfig
   bundle.mainreporoot=$TESTTMP
+  extensions.chgserver= (?)
   ui.username=$FAKEUSER
 
   $ unset FAKEUSER
@@ -156,6 +159,7 b' customized hgrc'
   $TESTTMP/hgrc:13: alias.log=log -g
   repo: bundle.mainreporoot=$TESTTMP
   $TESTTMP/hgrc:11: defaults.identify=-n
+  --config: extensions.chgserver= (?)
   $TESTTMP/hgrc:2: ui.debug=true
   $TESTTMP/hgrc:3: ui.fallbackencoding=ASCII
   $TESTTMP/hgrc:4: ui.quiet=true
@@ -171,6 +175,7 b' plain hgrc'
   $ hg showconfig --config ui.traceback=True --debug
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
+  --config: extensions.chgserver= (?)
   --config: ui.traceback=True
   --verbose: ui.verbose=False
   --debug: ui.debug=True
@@ -190,6 +195,7 b' plain mode with exceptions'
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   $TESTTMP/hgrc:15: extensions.plain=./plain.py
+  --config: extensions.chgserver= (?)
   --config: ui.traceback=True
   --verbose: ui.verbose=False
   --debug: ui.debug=True
@@ -200,6 +206,7 b' plain mode with exceptions'
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   $TESTTMP/hgrc:15: extensions.plain=./plain.py
+  --config: extensions.chgserver= (?)
   --config: ui.traceback=True
   --verbose: ui.verbose=False
   --debug: ui.debug=True
@@ -210,6 +217,7 b' plain mode with exceptions'
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   $TESTTMP/hgrc:15: extensions.plain=./plain.py
+  --config: extensions.chgserver= (?)
   --config: ui.traceback=True
   --verbose: ui.verbose=False
   --debug: ui.debug=True