-Added TICK_60 to the events list in supervisord_contrail_database.conf to handle periodic events for database node-manager
-send database usage stats periodically. Presently, its being sent on PROCESS_STATE event
Closes-Bug: #1350034,#1347741

Change-Id: Ic9350153330bb8b0c3e187518bee46facba2a611
(cherry picked from commit cc126a1f98ded31e83a52fdbba4e0c9612fe2377)