MB-11374: hide delta recovery option in not fully 3.0+ clusters

Change-Id: I23562598e86d9470ff48b79bc7ac2497c8f5c06f
Reviewed-on: http://review.couchbase.org/38304
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>