Stop calling a blocking function in get_events_for_object() (#3132)
Stop calling a blocking function in get_events_for_object() (#3132)

Calling kube_client.core.list_namespaced_event() was blocking the
asyncio event loop and making `paasta status -v` for services with a
large amount of Pods hang forever as the gunicorn worker serving the
request would eventually hit a timeout and die.

This PR wraps list_namespaced_event() into an awaitable and allows us to
actually make N concurrent requests instead of doing these serially.
Yelp/paasta,Yelp/paasta