transactionalUndo -> undo

Missed two tests in earlier checkins.

src/ZEO/tests/Cache.py

@@ -42,7 +42,7 @@ class TransUndoStorageWithCache:
         t.note('undo1')
         self._storage.tpc_begin(t)
 
-        tid, oids = self._storage.transactionalUndo(tid, t)
+        tid, oids = self._storage.undo(tid, t)
 
         # Make sure this doesn't load invalid data into the cache
         self._storage.load(oid, '')

src/ZEO/tests/CommitLockTests.py

@@ -195,7 +195,7 @@ class CommitLockUndoTests(CommitLockTests):
 
     def _begin_undo(self, trans_id, txn):
         rpc = self._storage._server.rpc
-        return rpc._deferred_call('transactionalUndo', trans_id, id(txn))
+        return rpc._deferred_call('undo', trans_id, id(txn))
 
     def _finish_undo(self, msgid):
         return self._storage._server.rpc._deferred_wait(msgid)