Returns a section of the config

        Args:
            regex (str): A valid regular expression used to select sections
                of configuration to return
            config (str): The configuration to return.  Valid values for config
                are "running_config" or "startup_config".  The default value
                is "running_config"

        Returns:
            The configuration section as a string object.

def section(self, regex, config='running_config'):
        """Returns a section of the config

        Args:
            regex (str): A valid regular expression used to select sections
                of configuration to return
            config (str): The configuration to return.  Valid values for config
                are "running_config" or "startup_config".  The default value
                is "running_config"

        Returns:
            The configuration section as a string object.
        """
        if config in ['running_config', 'startup_config']:
            config = getattr(self, config)
        match = re.search(regex, config, re.M)
        if not match:
            raise TypeError('config section not found')
        block_start, line_end = match.regs[0]

        match = re.search(r'^[^\s]', config[line_end:], re.M)
        if not match:
            raise TypeError('could not find end block')
        _, block_end = match.regs[0]

        block_end = line_end + block_end
        return config[block_start:block_end]