MB-19473 log goxdcr upgrade success to user log
MB-19473 log goxdcr upgrade success to user log

since the failure is logged to user log, the customer should know
that upgrade was restarted and eventually succeeded

Change-Id: Ife99a1f21bbbccc564a84aead4511f5506e973ad
Reviewed-on: http://review.couchbase.org/63773
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

membase/ns_server,ceejatec/ns_server,ceejatec/ns_server,ceejatec/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server,membase/ns_server