log creation of single vbucket mover
log creation of single vbucket mover

So that we can diagnose MB-5155 better.

Change-Id: I3b7a7d71274c9a53d7f1ea70460c18a2b6deeb54
Reviewed-on: http://review.couchbase.org/15182
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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