In a carrier interop we saw the call get killed for SRTP failures
during a reinvite.  We're wondering if the SRTP errors may have been
transitory and if it may have recovered after a few more packets.

It's debatable whether we should kill calls at all for SRTP auth
failures; semantically the right thing to do when a MAC fails is to
ignore the packet completely.  So raising this limit to 100 packets
shouldn't do any harm.  With this change we still warn at 10 errors
and every 10 errors thereafter.