remove calls to couchdb logger from couch_api_wrap_httpc

.. because it will be called on ns_server node which doesn't
have couchdb logger

Change-Id: Ia89af94b91ee1a80e510db004cb3c3d55353ddce
Reviewed-on: http://review.couchbase.org/42089
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
use sockets from pool for all calls to memcached from capi_replication

and capi_frontend to be able to host capi_replication and capi_frontend
on a node without ns_memcached server

Change-Id: I429b01db0e3c739bcf3272b7fd719da9bb67f74b
Reviewed-on: http://review.couchbase.org/42149
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>