MB-5307 Handle missing supervisor when stopping replications.
MB-5307 Handle missing supervisor when stopping replications.

Which is the case for old nodes that don't have ns_vbm_new_sup.

Change-Id: I837df5ccc97fb6808202f45d4c0c150d4c9e7b9d
Reviewed-on: http://review.couchbase.org/17801
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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