Use common get_instance call in API plugins part 3

Cleanup v2.1 API to use common get_instance call which
automatically does exception handling. Although most of
the v2.1 API was cleaned up a while back, some recent
ports of v2 API code has resulted in some cases creeping
backing in.

Change-Id: I8271a2805fe9fdfae40df43183a5251fddbe4c13
Merge "Use common get_instance call in API plugins part 3"