PT44186927 - Sometimes sipXsaa consumes most of the CPU

By default reg subscriptions were refreshed by the stack after being alive a full day.
This means that subscriptions were terminated and redone immediately. sipXsaa was caught
in an infinite loop when restart was taking place. Redone all loops to be more clear when
they should stop.
PT44320669 - sipXsaa duplicates restarted reg subscriptions

When the SIP stack restarted a reg subscription after the subscription was alive for a full day,
SAA also triggered creation of another reg subscription resulting in duplicate reg subscriptions
for the same AOR. RLS does not have this behavior. The code responsible for this was removed.