MB-5307: added master activity event for death of vbucket mover
MB-5307: added master activity event for death of vbucket mover

Change-Id: I249c7b34f6b6786579e3e3b7da782d6f04b45d2f
Reviewed-on: http://review.couchbase.org/16167
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

vzasade/ns_server,membase/ns_server,mschoch/ns_server,mschoch/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,membase/ns_server,vzasade/ns_server,vzasade/ns_server,nimishzynga/ns_server,daverigby/ns_server,daverigby/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,daverigby/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,membase/ns_server,ceejatec/ns_server,pavel-blagodov/ns_server,membase/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,membase/ns_server,ceejatec/ns_server,mschoch/ns_server,daverigby/ns_server,ceejatec/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server,ceejatec/ns_server,membase/ns_server,vzasade/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server