docs: def enable_user(self, user):
          """Enable the root account on the remote host.
  
  
          Since the host may have been deployed using a Cloud image, it may not
          be possible to use the 'root' account. This method ensure the root
          account is enable, if this is not the case, it will try to get the name
          of admin user and use it to re-enable the root account.
          """
          if user in self.ssh_pool._ssh_clients:
              return
  
          if user == 'root':
              _root_ssh_client = ssh.SshClient(
                  hostname=self.hostname,
                  user='root',
                  key_filename=self._key_filename,
                  via_ip=self.via_ip)
  
              # connect as a root user
              _root_ssh_client.start()
              result, _ = _root_ssh_client.run('uname -a')
  
              image_user = None
              # check if root is not allowed
              if 'Please login as the user "cloud-user"' in result:
                  image_user = 'cloud-user'
                  _root_ssh_client.stop()
              elif 'Please login as the user "fedora" rather than the user "root"' in result:
                  image_user = 'fedora'
                  _root_ssh_client.stop()
              elif 'Please login as the user "centos" rather than the user "root"' in result:
                  image_user = 'centos'
                  _root_ssh_client.stop()
  
              if image_user:
                  self.enable_user(image_user)
                  LOG.info('enabling the root user')
                  _cmd = "sudo sed -i 's,.*ssh-rsa,ssh-rsa,' /root/.ssh/authorized_keys"
                  self.ssh_pool.run(image_user, _cmd)
                  _root_ssh_client.start()
              self.ssh_pool.add_ssh_client('root', _root_ssh_client)
              return
  
          # add the cloud user to the ssh pool
          self.ssh_pool.build_ssh_client(
              hostname=self.hostname,
              user=user,
              key_filename=self._key_filename,
              via_ip=self.via_ip)