localrepo: import "lock" module as "lockmod" for readability

Before this patch, "localrepo.py" has many methods defining local
variable "lock", even though it imports "lock" module as "lock". This
ambiguity decreases readability.

mercurial/localrepo.py

@@ -8,7 +8,8 b' from node import hex, nullid, short'
 from i18n import _
 import peer, changegroup, subrepo, discovery, pushkey, obsolete, repoview
 import changelog, dirstate, filelog, manifest, context, bookmarks, phases
-import lock, transaction, store, encoding
+import lock as lockmod
+import transaction, store, encoding
 import scmutil, util, extensions, hook, error, revset
 import match as matchmod
 import merge as mergemod
@@ -1001,15 +1002,16 b' class localrepository(object):'
 
     def _lock(self, lockname, wait, releasefn, acquirefn, desc):
         try:
-            l = lock.lock(lockname, 0, releasefn, desc=desc)
+            l = lockmod.lock(lockname, 0, releasefn, desc=desc)
         except error.LockHeld, inst:
             if not wait:
                 raise
             self.ui.warn(_("waiting for lock on %s held by %r\n") %
                          (desc, inst.locker))
             # default to 600 seconds timeout
-            l = lock.lock(lockname, int(self.ui.config("ui", "timeout", "600")),
-                          releasefn, desc=desc)
+            l = lockmod.lock(lockname,
+                             int(self.ui.config("ui", "timeout", "600")),
+                             releasefn, desc=desc)
         if acquirefn:
             acquirefn()
         return l