First pass at some basic operational metrics for shared_port. #4094

Just some basic counters for things like number of sockets in
progress of being passed, number of sockets successfully passed,
number that failed, etc.  Since the shared_port currently does
not send an ad to the collector, these stats are periodically
written to the shared_port log file (every 5 minutes by default),
and also written into the shared_port daemon/address ad that is
written to disk.
Merge branch 'V8_1_4-tt_shared_port-branch' into V8_1_4-branch