bundle2: move bundle2 config option to section "experimental"

bundle2: move bundle2 config option to section "experimental"

We highlight the fact that this is experimental by moving it to an "experimental"
section, and we match the config name with the server capability name
`bundle2-exp`.

--- a/mercurial/localrepo.py	Thu Apr 17 15:45:12 2014 -0400
+++ b/mercurial/localrepo.py	Thu Apr 17 16:01:58 2014 -0400
@@ -305,7 +305,7 @@
     def _restrictcapabilities(self, caps):
         # bundle2 is not ready for prime time, drop it unless explicitly
         # required by the tests (or some brave tester)
-        if self.ui.configbool('server', 'bundle2', False):
+        if self.ui.configbool('experimental', 'bundle2-exp', False):
             caps = set(caps)
             capsblob = bundle2.encodecaps(self.bundle2caps)
             caps.add('bundle2-exp=' + urllib.quote(capsblob))

--- a/mercurial/wireproto.py	Thu Apr 17 15:45:12 2014 -0400
+++ b/mercurial/wireproto.py	Thu Apr 17 16:01:58 2014 -0400
@@ -585,7 +585,7 @@
         # otherwise, add 'streamreqs' detailing our local revlog format
         else:
             caps.append('streamreqs=%s' % ','.join(requiredformats))
-    if repo.ui.configbool('server', 'bundle2', False):
+    if self.ui.configbool('experimental', 'bundle2-exp', False):
         capsblob = bundle2.encodecaps(repo.bundle2caps)
         caps.append('bundle2-exp=' + urllib.quote(capsblob))
     caps.append('unbundle=%s' % ','.join(changegroupmod.bundlepriority))

--- a/tests/test-bundle2.t	Thu Apr 17 15:45:12 2014 -0400
+++ b/tests/test-bundle2.t	Thu Apr 17 16:01:58 2014 -0400
@@ -174,8 +174,8 @@
   $ cat >> $HGRCPATH << EOF
   > [extensions]
   > bundle2=$TESTTMP/bundle2.py
-  > [server]
-  > bundle2=True
+  > [experimental]
+  > bundle2-exp=True
   > [ui]
   > ssh=python "$TESTDIR/dummyssh"
   > [web]