No longer support -F
Formatting
Expose function to disconnect collectd socket
Provide proper errors when we fail to insert events
Minor fixes in radsniff (exit codes and formatting)
Periodically re-open collectd sockets if we get a SIGPIPE

Fix fr_event_insert calls in radsniff which were failing due to lack of parent pointer

Switch to using a proper signalling pipe in radsniff (like FreeRADIUS already does)