https://jira.hyperledger.org/browse/FAB-2662

Changing the CouchDB dockers used in fabric to  use recommended
configuration (couchdb local.ini).

Include config comments in local.ini stating how to enable
user security.

Also, making sure that all CouchDB unit-tests follow the same procedure
for setting up address and login credentials.  Including test
comments stating how to run tests against CouchDB with
user security enabled.

Change-Id: I975d04d757d0371c8db03acf0ddcf92c01c35f8c
Signed-off-by: Adnan Choudhury <adnan.choudhury@itpeoplecorp.com>
Signed-off-by: denyeart <enyeart@us.ibm.com>