TRQ-1776. Don't allow jobs to be stuck forever when a sister doesn't respond to a kill or abort job request. Previously, mother superior would wait indefinitely to receive a response from each of the sister nodes confirming that the job is dead. Instead, consider the job dead after 10 minutes and clean it up. This time can be controlled by setting $job_exit_wait_time in the mom's config. The time should be specified in seconds but will control how long mother superior waits before calling the job dead and sending the obit to pbs_server.
Merge branch '4.2-dev' of https://github.com/adaptivecomputing/torque into 4.2-dev