Perform hostname lookups and sink checks as well as error recovery.

Will perform a hostname lookup to determine sink ip address.

Every WAKE_CYCLES_PER_SINK_CHECK times awake, will lookup the hostname
and do a CON post instead of a quick NON. A failure counter is
incremented if the lookup or CON fails. After SINK_CHECK_TRIES
failures, the node will reboot in last ditch effort to recover.