Precommit script over-zealous zombie check may clobber parallel Phoenix test

The precommit script has a zombie check, that does not take into account the fact that there may be multiple Phoenix "mvn verify" checks running on the same Jenkins worker.

When the mvn verify of the precommit script finishes, it checks if there are still mvn verify jobs running for Phoenix - finds the processes for the second job - , flags those as Zombies, and kills their processes.

test-patch.sh 899-922 lines