[MERGE] Perform creation of BzrDirMetaFormat1 control directories using an RPC where possible. (Robert Collins)

[Robert Collins]

This changes creation of .bzr control directories on smart transports to
use the existing RPC when possible.

This drops 13 round trips of initial-push use cases, dropping the
ratchet for initial push scenarios and also adds a close-to-the-code
unit test to make sure this specific case doesn't regress.

-Rob
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