[merge] LockDir creates 'lock/' as part of lock_write()

[John Arbash Meinel]

This bug was reported recently:
https://launchpad.net/products/bzr/+bug/56974

Basically, the problem is that someone manually deleted the
'.bzr/repository/lock/' directory, which means that all future actions
fail to create their pending directories.

The attached patch changes LockDir.lock_write() so that if the mkdir()
on the pending directory fails with a NoSuchFile, it goes back and tries
to create the parent lock/ directory, and tries again.

This is a case of a user messing up their own repository, but I think
this patch handles recovering gracefully.

The alternative would be to raise another error, with a hopefully more
obvious comment, saying that the lock directory is missing.

I don't know if this is an 0.10 fix or not. It is small, but I have no
problem waiting for 0.11.

John
=:->
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