bundle2: rename server capability to bundle2-exp

For the same reason, we advertise this bundle2 implementation and format as
experimental. This will leave room for field testing in 3.0 but won't conflict
with a stable implementation in 3.1.

mercurial/exchange.py

@@ -132,7 +132,7 b' def push(repo, remote, force=False, revs'
                 pushop.repo.prepushoutgoinghooks(pushop.repo,
                                                  pushop.remote,
                                                  pushop.outgoing)
-                if pushop.remote.capable('bundle2'):
+                if pushop.remote.capable('bundle2-exp'):
                     _pushbundle2(pushop)
                 else:
                     _pushchangeset(pushop)
@@ -207,7 +207,7 b' def _pushbundle2(pushop):'
     The only currently supported type of data is changegroup but this will
     evolve in the future."""
     # Send known head to the server for race detection.
-    capsblob = urllib.unquote(pushop.remote.capable('bundle2'))
+    capsblob = urllib.unquote(pushop.remote.capable('bundle2-exp'))
     caps = bundle2.decodecaps(capsblob)
     bundler = bundle2.bundle20(pushop.ui, caps)
     # create reply capability
@@ -515,7 +515,7 b' def pull(repo, remote, heads=None, force'
     lock = pullop.repo.lock()
     try:
         _pulldiscovery(pullop)
-        if pullop.remote.capable('bundle2'):
+        if pullop.remote.capable('bundle2-exp'):
             _pullbundle2(pullop)
         if 'changegroup' in pullop.todosteps:
             _pullchangeset(pullop)

mercurial/localrepo.py

@@ -308,7 +308,7 b' class localrepository(object):'
         if self.ui.configbool('server', 'bundle2', False):
             caps = set(caps)
             capsblob = bundle2.encodecaps(self.bundle2caps)
-            caps.add('bundle2=' + urllib.quote(capsblob))
+            caps.add('bundle2-exp=' + urllib.quote(capsblob))
         return caps
 
     def _applyrequirements(self, requirements):

mercurial/wireproto.py

@@ -587,7 +587,7 b' def _capabilities(repo, proto):'
             caps.append('streamreqs=%s' % ','.join(requiredformats))
     if repo.ui.configbool('server', 'bundle2', False):
         capsblob = bundle2.encodecaps(repo.bundle2caps)
-        caps.append('bundle2=' + urllib.quote(capsblob))
+        caps.append('bundle2-exp=' + urllib.quote(capsblob))
     caps.append('unbundle=%s' % ','.join(changegroupmod.bundlepriority))
     caps.append('httpheader=1024')
     return caps