This commit implements Authenticate() API of the auth package. It does
authentication based on its authUsers bucket and generate a token for
succeeding RPCs.
This commit adds a functionality of user deletion. It can be invoked
with the new user delete command.
Example usage:
$ ETCDCTL_API=3 etcdctl user delete usr1
This commit adds a new subcommand "user add" to etcdctlv3. With the
command users can create a user for the authentication.
Example of usage:
$ etcdctlv3 user add user1
Password of user1:
Type password of user1 again for confirmation:
