Use htpasswd to create users and provide commands for basic user mgmt

[jorgemoralespou]

We need to change the oauth provider to HTPasswd and provide basic commands to add users to the profile:

• add-user <USERNAME> <PASSWORD> <TYPE>
• remove-user <USERNAME>

No need to change password. If necessary, remove user and create again.

<TYPE> can be cluster-admin, sudoer, user