queryport/client: Free up cluster change watcher go-routine
queryport/client: Free up cluster change watcher go-routine

Services change notifier object can be deallocated and thus blocking
services change notifier Get() call can return to free up watcher go-routine.

Change-Id: I2721c76c0b7d433ad47473e8f1d081f155dd8c46

jchris/indexing,jchris/indexing,jchris/indexing,jchris/indexing