Add tests for new broctl features

Added tests for CPU pinning, PF_RING multiple cluster IDs, and the "env_vars"
option.
Merge remote-tracking branch 'origin/topic/dnthayer/broctl-tests'

* origin/topic/dnthayer/broctl-tests:
  Add tests for new broctl features

BIT-1074 #merged
Merge branch 'master' of ssh://git.bro.org/broctl into topic/vladg/config-starting-port