[MERGE] Create and use a RPC call to create branches on bzr servers rather than using VFS calls.

[John Arbash Meinel]

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Robert Collins wrote:
> This  test reduces RPC call made during pushing of new branches and
> stacked branches to bzr: servers; for trivial branches 24 less calls are
> made, and for trivial stacked branches 23 less calls are made.
> 
> Yay.
> 
> 
> 

+        # Creating on a remote bzr dir.
+        # 2) try direct creation via RPC
+        path = a_bzrdir._path_for_remote_call(a_bzrdir._client)
+        verb = 'BzrDir.create_branch'
+        try:
+            response = a_bzrdir._call(verb, path, network_name)
+        except errors.UnknownSmartMethod:
+            # Fallback - use vfs methods
+            return self._vfs_initialize(a_bzrdir)
+        if response[0] != 'ok':
+            raise errors.UnexpectedSmartServerResponse(response)


^- Can we make sure that when the fallback code path gets used we get
something put into ~/.bzr.log?

Perhaps this is easiest to put it where errors.UnknownSmartMessage is
being raised. But I think it is important to have runtime documentation
that a fallback code path is being used.

John
=:->

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