No validation of config in `create ignition-configs`

[vrutkovs]

If the user brings in an incorrect install-config (e.g. metadata.name is empty or baseDomain is empty) and runs create ignition-configs the config is not validated. This would make bootstrap node breaks at some point, but this could be easily prevented by validating the configs first

[eparis]

@staebler

[staebler]

This validation is included in #711.