KILLTIMEOVERRIDE param not being honored.

[robnester]

Issue:

KILLTIMEOVERRIDE param not being honored.

Steps to reproduce:

A test was created with a metadata defined duration of 240 minutes in its Makefile.
In the associated XML for a Beaker job, the KILLTIMEOVERRIDE parameter was set to a larger value (259200) for a duration of 72 hours.

Expected results:

The test should continue to run until completion or until 72 hours have passed, whichever occurs first.

Actual results:

This test aborts approximate to the 240 minute mark.