Refactored all logging and find_expired_data
…and all calls to `find_expired_data` in curator and the integration tests.
Sending back a tuple with the expired index and the time difference was fancy, but not needed.  It was causing issues, so I cleaned up logging, added a logstash log format, fixed dry run reporting in logging so it's more clear that changes will not be made, and cleared up some ambiguity reported in #112
Tests were fixed to reflect changes in code.