As sync_local_state periodic task can be disabled, which will lose
out on hash ring refresh, so the refresh logic should be independent
of it. this patch adds a updated_at to HashRingManager to track of
when the ring was last refreshed, and when checks the ring is set,
also check the age and rebuild if older than the new config option
hash_ring_reset_interval which is default to 180s.
Change-Id: Ie46dbf93b920543f99e11774a29878aaf27c3400
Closes-Bug: #1506657
fb1a67fe6b