MB-11839: [xdcr] don't retry http posts on ssl errors

Change-Id: I19349768c482d5282b259870b5a1b3d243417445
Reviewed-on: http://review.couchbase.org/40147
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>