Update the requirement R-87234 to support to PNF onboarding on Dublin release.

Proposed change:

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Requirement: R-87234

target: VNF/PNF

keyword: MUST

introduced: Dublin

The VNF/PNF package provided by a VNF/PNF vendor MUST be either with TOSCA-Metadata directory (CSAR Option 1) or without TOSCA-Metadata directory (CSAR Option 2) as specified in ETSI GS NFV-SOL004. On-boarding entity (ONAP SDC) must support both options.

Note: SDC supports only the CSAR Option 1 in Dublin. The Option 2 will be considered in future ONAP releases,

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