XX-10725: empty call rate limit breaks iptables generation

- check if limits for a call rate rule not null befoe tryng to generate iptable rules
XX-10725: empty call rate limit breaks iptables generation

- log only in case no rule limit
XX-10734 - bug fix: group settings are missing from Polycom group. They were mistakenly hidden in previous commit.
UC-11 - PIN Field Missing from Import Help Text
XX-5807:  Unregister all (contact: *) is broken because SipRouter::addNatMappingInfoToContacts rewrites the contact even if it is not an actual sip uri.
UC-1325: OpenACD drop voicemail call from dashboard

* Kill ring_uuid instead of 'uuid'-vm
UC-1426: MoH should be configurable as Highly Available
UC-1314 Create a tool that would print out registration
 records in mongo and be able to delete registrations by
 certain filed like identity or call-id etc
UC-1314 Create a tool that would print out registration
 records in mongo and be able to delete registrations by
 certain filed like identity or call-id etc
- XX-9425 - MongoDB: Regression test code for sipXcommServerLib