Fix the change in NFVIFA(18)00503 that changed the layerProtocol attribute from 1 to 1..N.
SOL006 has implemented the IFA CR above. However, the cardinality of layerProtocol is 1..N, not 0..N as implemented in SOL006.
To correct it SOL006 needs to add 'min-elements 1' under layerProtocol.
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