[merge] LockDir: use put_file_non_atomic instead of append_file

[John Arbash Meinel]

The attached bundle just changes LockDir to use the new
'put_file_non_atomic()' since it saves an extra round trip with sftp.

When locking a remote directory, this saves a round trip for each lock.
So in the common case, this saves 2 round trips. (For me, this is 200+ms
when committing or pushing to Launchpad).

John
=:->

PS> I"m doing some analysis of a commit over sftp, to see where we are
spending our time. It is quite revealing, and I hope to finish it soon.


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