using pyon find_events() method in UNS find_events()
fixed a couple of tests and got the find_events() fixed
Referring to the latest in ion defs
Using the container's event repository in find_events() instead of creating a new instance of EventRepository
increased number of polling tries as it may help in fixing a test that fails sporadically probably
merged with master and resolved conflicts
Merge pull request #564 from swarbhanu/refactor_find_events

UNS' find_events() now uses the container's event_repository's find_events()