Adding new requirement for supporting non-mano artifcats requirements in PNF packaging 

Proposed Change:

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Requirement: R-146092

target: VNF/PNF TOSCA CSAR package manifest

keyword: MUST

introduced: Dublin

The VNF/PNF TOSCA CSAR package Manifest file MUST contain: non-mano artifact set with following ONAP public tag

-onap_ves_events: contains VES registration files

-onap_pm_dictionary: contains the PM dictionary files

-onap_yang_modules: contains Yang module files for configurations

-onap_ansible_playbooks: contains any ansible_playbooks

-onap_others: contains any other non_MANO artifacts, e.g. informational documents

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