bp MB-9612: handling remote_cluster_info error more gracefully

This is a backport for a fix merged in 2.5. Original commit is:

http://review.couchbase.org/#/c/30650/

Change-Id: Iad81f2cc53d71e55ce1a69856099f6031546bba1
Reviewed-on: http://review.couchbase.org/30804
Tested-by: Junyi Xie <junyi.couchbase@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>