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
Revert "UC-11 - PIN Field Missing from Import Help Text"

This reverts commit a4cdb74e7d9e1ea328a19bb1c4dce6847bb3dbf1.
UC-1120 SQA warnings logged without any calls
http://track.sipfoundry.org/browse/UC-1120

Changed log level from warning to info for the following messages:
  "StateQueueConnection::onInactivityTimeout No activity on this
  socket for too long."
  "StateQueueConnection::handleRead TERMINATED - Operation canceled
  Most likely remote closed the connection."
UC-1548: Create resource-limits.ini as a central config for fd and core limits

Also fixed task: AdminConfig.replicate is never called

-generic approach: admin settings page sets defaults for proxy, rls, registrar, saa, park, mwi resource limits
each process outlined above can set its own resource limits on their settings page.
Any time admin settings can overwrite the resource limits for all outlined processes above

test added