mercurial: enabled support of verify command.

rhodecode/lib/vcs/backends/hg/repository.py

@@ -267,6 +267,12 b' class MercurialRepository(BaseRepository'
         self.commit_ids = self._get_all_commit_ids()
         self._rebuild_cache(self.commit_ids)
 
+    def verify(self):
+        verify = self._remote.verify()
+
+        self._remote.invalidate_vcs_cache()
+        return verify
+
     def get_common_ancestor(self, commit_id1, commit_id2, repo2):
         if commit_id1 == commit_id2:
             return commit_id1