DB migration upgrade/downgrade not employed for brocade-plugin

Fixes bug: 1238921

Change-Id: I441d82a92588d7318a2f3b725643bc1b050a2c9c
(cherry picked from commit 9d01010e8826eafc48044fc4018944a34bc96ba4)
Merge "DB migration upgrade/downgrade not employed for brocade-plugin" into milestone-proposed