Resctrict access to users

Put a dict named ADMIN_CLI_USERS in settings.py. It must have the following format:

ADMIN_CLI_USERS = {
  'login': 'RW',
}

Keys are UID or username, values are rights ‘R’ for read, ‘W’ for write/update/delete and ‘RW’ for both.

By default ADMIN_CLI_USERS is {} which allows all users to make all operations.