docs: def execute_command(self, command, **kwargs):
          """Execute a command on the node
  
          Args:
              command (str)
  
          Kwargs:
              username (str)
          """
  
          self.info_log("executing command: %s" % command)
  
          try:
              ssh = paramiko.SSHClient()
              ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
  
              username = kwargs.get(
                  'username',
                  self.browser_config.get('username')
              )
              password = self.browser_config.get('password')
  
              ssh.connect(self.get_ip(), username=username, password=password)
  
              stdin, stdout, stderr = ssh.exec_command(command)
  
              ssh.close()
  
              return (stdout, stderr)
  
          except Exception as e:
              msg = "Execute_command exception: %s" % str(e)
              self.error_log(msg)
              raise Exception(msg)