MB-22252 change the behavior of waiting for password
MB-22252 change the behavior of waiting for password

CB_WAIT_FOR_MASTER_PASSWORD is not used anymore

The new behavior is:
1. Try password supplied in env var CB_MASTER_PASSWORD or if
   variable is not set then ""
2. If password doesn't match, then fall back into prompting password
   routine

To enter initial password for node you need:
1. Start node
2. Use CLI: couchbase-cli master-password -c 127.0.0.1:9000 -u Administrator -p password --new-password

Change-Id: I45049eec21a9c59ac79d33a46cf6888321e3a3d3
Reviewed-on: http://review.couchbase.org/75201
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server