calamari-ctl: add --password arg to change_password

This allows setting a user's password from the command line without
prompting interactively.

Signed-off-by: Tim Serong <tserong@suse.com>
calamari-ctl: Add rename_user command

This allows the admin user account to be renamed.

Signed-off-by: Tim Serong <tserong@suse.com>
calamari-ctl: fix lint failure from last commit

Signed-off-by: Tim Serong <tserong@suse.com>
Merge pull request #230 from SUSE/wip-user-manipulation

Allow admin user to be renamed, and noninteractive password changes