Jason Tedor 484ad31ed9 Clarify that plugins can be closed
Plugins are closed if they implement java.io.Closeable but this is not
clear from the plugin interface. This commit clarifies this by declaring
that Plugins implement java.io.Closeable and adding an empty
implementation to the base Plugin class.

Relates #21669
2016-11-18 13:04:28 -05:00
..
2016-11-18 13:04:28 -05:00