Fabric Ensemble creation fails if zookeeper password does not match the password of the admin user.

Issue

When adding members to an Ensemble, we get a javax.security.auth.login.FailedLoginException: Password does not match if the Zookeeper password is not the same as the admin user's password.

host1: fabric:create --clean --zookeeper-password <new_pswd>
host2:fabric:join --zookeeper-password <pswd> <host1>
host3:fabric:join --zookeeper-password <pswd> <host2>
host1: fabric:ensemble-add node2 node3