lock: Fix import cycle breakage

fa2049f caused an import cycle between lock.py and misc.py.  Move the
needed functions from lock.py to lockstatus.py so that we can avoid the
import cycle.

Signed-off-by: Sam Lang <sam.lang@inktank.com>

Conflicts:
	teuthology/lock.py

teuthology/lockstatus.py

@@ -22,4 +22,3 @@ def get_status(ctx, name):
         return json.loads(content)
     return None
 
-