feat(convertNetconf): Adding support for network config conversion

Adding the flag -convertNetconf which is used to specify the config
format to convert from (right now, only 'debian' is supported).
Once the network configs are generated, they are written to
systemd's runtime network directory and the network is restarted.
feat(systemd): Updating the systemd unit files to use configdrive

This makes it so that /media/configdrive can be used for user-data
and network configs.