MB-11630: avoid max_restart_intensity on crash of xdc_lhttpc_pool

xdc_lhttpc_pool may spuriously fail sometimes. And for different
reason single crash usually leads to avalanche of crashes. We're
simply changing supervision setup for us to tolerate it better.

Change-Id: I521cd754e4caaf5085e278786b0e84741266eed1
Reviewed-on: http://review.couchbase.org/39170
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>