[MERGE] Stop treating Permission Denied as lock contention

[Aaron Bentley]

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Hi all,

Currently, bzr treats "Permission Denied" as lock contention.  This is
bad, because it means that bzr will wait on a lock that will never be
released.  (Barring an external chmod, etc.)  Treating all PathErrors as
lock contention is a change originally introduced to support SFTP better.

This bundle causes "Permission Denied" to specifically be permitted,
while other classes derived from PathError continue to be treated as
lock contention.

This bundle should probably be tested on win32 before we apply it,
because win32 is known be be a bit weird about the "permission denied"
error code.

Aaron
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