propertyNames is not always complete (how to maintain?)

At least in hmc_schemas/hmc_license_1_0_0.json the enum propertyNames does not contain all attributes from common_properties_json_schema_cct1.json, resulting in an invalid form. I suggest removing propertyNames entirely.

According to the documentation, the purpose of this attribute is if you don’t want to enforce specific properties, but you want to make sure that the names of those properties follow a specific convention.

http://json-schema.org/understanding-json-schema/reference/object.html#property-names

!Check last few comments in #3 (closed) for a potential solution to this!