When the JGroups channel is not created by Infinispan, as it happens in AS7, the channel can be closed before the cache manager has finished stopping.

Because of JGRP-1508, this can block cache leave commands (or cache view installation commands, if the local node was the coordinator) for 1 minute (the default RSVP timeout).

We can work around this, at least for cache view installation commands, by calling shutdownNow() on the cache view installation executor.