[MERGE] Pass create_prefix paremeter to BzrDir.push_branch.

[Jelmer Vernooij]

This patch makes cmd_push pass the create_prefix parameter to
BzrDir.push_branch(). This is required for bzr-svn to support "bzr push
--create-prefix". The regular way of detecting that a prefix doesn't
exist will not work for Subversion, since control dirs are "virtual" and
therefor always exist.

Cheers,

Jelmer
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