[MERGE] Handle lock contention on NFS

[Aaron Bentley]

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Unlike local filesystems, NFS produces EBUSY when you try to rename a
directory on top of one already present.  This patch fixes that.

It also adds a FakeNFSTransport to use for testing NFS-specific
behaviour.  It also adds support for the fake NFS transport on the
commandline:
bzr selftest --transport fakenfs lockdir

All the lockdir tests pass, but others which assume a local transport do
not.

Branch at: http://panoramicfeedback.com/opensource/bzr/repo/nfslocks/

Aaron
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