[cli] updating how test status messages are stored and reported * A StatusMessage class is now used (subclass of namedtuple object) to store   any relevant issues during rule processing. * These messages are then logged using a logger at the end of execution for uniformity.
[cli] updating how test status messages are stored and reported
* A StatusMessage class is now used (subclass of namedtuple object) to store
  any relevant issues during rule processing.
* These messages are then logged using a logger at the end of execution for uniformity.

airbnb/streamalert,airbnb/streamalert