Execute a command

        Args:
            command (str)

        Returns:
            process (object)

def execute_command(self, command):
        """Execute a command

        Args:
            command (str)

        Returns:
            process (object)
        """

        self.runner.info_log("Executing command: %s" % command)

        process = Popen(
                command,
                stdout=open(os.devnull, 'w'),
                stderr=open('runner.log', 'a'),
        )

        return process