bundle2: use bundle2 by default

All the test change have been isolated and validated. We have free to turn on
bundle2 as the default exchange protocol.

"To reach a port we must set sail –
Sail, not tie at anchor
Sail, not drift."

mercurial/exchange.py

@@ -59,7 +59,7 b' def _canusebundle2(op):'
     """return true if a pull/push can use bundle2
 
     Feel free to nuke this function when we drop the experimental option"""
-    return (op.repo.ui.configbool('experimental', 'bundle2-exp', False)
+    return (op.repo.ui.configbool('experimental', 'bundle2-exp', True)
             and op.remote.capable('bundle2'))
 
 

mercurial/repair.py

@@ -13,7 +13,7 b' import errno'
 
 def _bundle(repo, bases, heads, node, suffix, compress=True):
     """create a bundle with the specified revisions as a backup"""
-    usebundle2 = (repo.ui.config('experimental', 'bundle2-exp') and
+    usebundle2 = (repo.ui.config('experimental', 'bundle2-exp', True) and
                   repo.ui.config('experimental', 'strip-bundle2-version'))
     if usebundle2:
         cgversion = repo.ui.config('experimental', 'strip-bundle2-version')