Add salt.fileserver.svnfs.lock()
Add salt.fileserver.svnfs.lock()

Also rewrite salt.fileserver.svnfs.clear_lock() to accept a repo conf
dict instead of a pattern, so that locking and unlocking in
salt.fileserver.svnfs.update() can use the same code as the fileserver
runner.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt