don't start doc_replicat{or,ion_srv} for memcached buckets

Because we don't start corresponding capi_replication_manager for
them, so they crash regularly.

Change-Id: I22659ee9e1aa4b8dcab97c6758bd9b5369fde10f
Reviewed-on: http://review.couchbase.org/43111
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Artem Stemkovski <artem@couchbase.com>
only wait for ns_couchdb once and link to it's main supervisor

We now wait for ns_couchdb readyness in separate erlang process and
only in single place in code. That simplifies our code.

Change-Id: I53aa16fc7022ae9f72704ea7014e9658e56cfe9b
Reviewed-on: http://review.couchbase.org/43112
Reviewed-by: Artem Stemkovski <artem@couchbase.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
wait for ns_couchdb shutdown much longer

Change-Id: I04343faff7528e73efb14c9988f24727acf7616a
Reviewed-on: http://review.couchbase.org/43113
Reviewed-by: Artem Stemkovski <artem@couchbase.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>