Plugtest 2021: MEC012 RnisSubscription BV test suites validation errors

1. In test case Request RNIS subscription list

Check with variables seem not to work as expected.

Default value in {LINKS_SELF} doesn't use the proper v2 schema (v2 should use the 'href', not the string directly). It can be changed manually, but validation fails because the object types are different (dictionary vs string): {'href': 'http://3.84.255.29/simon/rni/v2/subscriptions'} (dictionary) != {'href': 'http://3.84.255.29/simon/rni/v2/subscriptions'} (string)

2. In test case Create RNIS subscriptions schemas/cellChangeSubscriptionRequest.schema.json cannot be found so validation cannot occur