Adapt CLI to use keycloak openid authentication

[skabashnyuk]

We need to change this code https://github.com/eclipse/che/blob/master/dockerfiles/lib/src/api/wsmaster/auth/auth-data.ts#L129 to use keycloak openid authentication.

1. I think we need a new client in che realm. Let's say 'curl' with "Bearer only" authentification.
2. Then, change the way how cli obtain token to something like this. curl --data "grant_type=password&client_id=che-public&username=admin&password=123456" http://192.168.65.2:5050/auth/realms/che/protocol/openid-connect/token

See also http://blog.keycloak.org/2015/10/getting-started-with-keycloak-securing.html

[garagatyi]

I did a small research on what is broken in CLI in the multiuser packaging though out the code and here is what I found:

• CLI actions, such as create user, create and start ws, ssh, remove user, execute command
• Che sync, Che mount
• Che dir, file
• Graceful stop
• Deploy on OS: replacing stacks

Notice that I did not test all these features but rather took a look on their internals to figure out what should be broken in the multiuser branch.