Added method to UsageRefactorService to get all existing load balancer host usage records and convert to a map of load balancers ids.  Implemented method in HostUsageRefactorRepository to get all load balancer host usage records and return a list.  Completed logic in UsagePollerHelper to process existing events.  Started work on logic for processing current usage.  Added more tests for process existing events.  Added UsageRefactorService to usage-jpa-persistence.xml.
Merge branch 'five_minute_poller_refactor' of github.com:lbrackspace/atlas-lb into five_minute_poller_refactor