Revert "MB-10858 Start ns_server_sup via intermediate process."

This reverts commit 6d9d0908f5fa203a9ae31299d21dd68e30024ea4.
This reverts commit 6a2df779dbe8f324369f1cf92fc8dd9a28da1032.
This reverts commit 572e81810c392ddb3b0630315dea5d9891f8ed6c.
This reverts commit d35dec51a6db4bfeb7494f07e31a608c197d5625.

Change-Id: Ie4cc186359e8494bf4f48cdd4a155b6f2941472b
Reviewed-on: http://review.couchbase.org/37420
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>