Remove a redundant cache invalidation

There is no need to invalidate a cache if nothing will access it before
it is invalidated again.

Author: DemiMarie

qubes/storage/lvm.py

@@ -411,7 +411,6 @@ async def _commit(self, vid_to_commit=None, keep=False):
             cmd = ['rename', self.vid,
                    '{}-{}-back'.format(self.vid, int(time.time()))]
             await qubes_lvm_coro(cmd, self.log)
-            await reset_cache_coro()
 
         cmd = ['clone' if keep else 'rename',
                vid_to_commit,