add affected resources methods to retrieve samples from ceilometer.
add filters to parse the output of samples, and discard potential duplicates based
on alarm data.
add failing test to alarm.
add evaluation_period and statistic to alarm. ( ex: avg, sum, min, max, count)
add request_id to action data object.

TODO: add get_by_request_id on action data
Merge branch 'master' of https://github.com/lcostantino/healing-os