MB-12750 start and babysit goxdcr

Change-Id: I27f0955233d978840380e2cca7b769fbd4f6fa13
Reviewed-on: http://review.couchbase.org/44162
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>