bench_tester.py and monitor_processes.py
bench_tester: includes additional validations when attack_mode != 0,
bench_tester had a weird behavior that we fixed using and intermediate file 'done'
We checked that file when we are in that attack_mode.
monitor_processes: It makes difference between /bin/sh and /bin/bash as discussed.
Some other improvements uploaded.
Merge branch 'master' of https://github.com/maverick-zhn/CS590Project