[2.7.1][SOL003/VNFPackageManagement-API/Subscriptions.robot] Get VNF Package Subscriptions with attribute-based filter - schema check not correct
`Get VNF Package Subscriptions with attribute-based filter` has a test ` Check HTTP Response Body Json Schema Is PkgmSubscription`
As per 10.4.7.3.2 of ETSI GS NFV-SOL 003 [1] v2.7.1 - the return type of this API should be a list of PkgmSubscription, which in api-tests is `PkgmSubscriptions.schema.json` . inspite of correct response from the api, the test case fails because of schema mismatch
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