ifconfig: T2057: bugfix KeyError
ifconfig: T2057: bugfix KeyError

Error introduced in commit b38dcaf ("ifconfig: T2057: generic interface option
setting").

File "/usr/lib/python3/dist-packages/vyos/ifconfig.py", line 146, in _get_sysfs
 filename = self._sysfs_get[name]['location'].format(config)
KeyError: 'ifname'

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x