Merge pull request #522 from youtube/resharding

Using faster my.cnf in tests. not sure how we got rid of that.

test/tablet.py

@@ -28,7 +28,7 @@ tablet_cell_map = {
 
 
 def get_all_extra_my_cnf(extra_my_cnf):
-  all_extra_my_cnf = []
+  all_extra_my_cnf = [environment.vttop + "/config/mycnf/default-fast.cnf"]
   flavor_my_cnf = mysql_flavor().extra_my_cnf()
   if flavor_my_cnf:
     all_extra_my_cnf.append(flavor_my_cnf)