statichttprepo: use LockUnavailable() instead of Abort() for lock (API)...
statichttprepo: use LockUnavailable() instead of Abort() for lock (API)
If we try to get a lock on statichttprepo, we get `error.Abort()` instead of
subclass of `error.LockError()`. The callers which catches `error.LockError`
fails to catch this case as the correct error is not raised.
Raising `error.LockUnavaible()` is same as what is done for wlock also.