Fixing import error in sync_db.py
Fixing import error in sync_db.py

Closes-Bug: #1477092

Change-Id: I6cd9df2adca7f99ee6fdbaf396800001aed650ac

openstack/mistral,StackStorm/mistral,dennybaa/mistral,dennybaa/mistral,openstack/mistral,StackStorm/mistral