Modify R-01427 to support VNFs and PNFs and only apply if Basic Auth is used

CURRENT REQUIREMENT: The PNF MUST support the provisioning of security and authentication parameters (HTTP username and password) in order to be able to authenticate with DCAE (in ONAP).
Note: In R3, a username and password are used with the DCAE VES Event Listener which are used for HTTP Basic Authentication.
Note: The configuration management and provisioning software are specific to a vendor
architecture.

PROPOSED REQUIREMENT: If the VNF or PNF is using Basic Authentication, then the VNF or PNF MUST support the provisioning of security and authentication parameters (HTTP username and password) in order to be able to authenticate with DCAE VES Event Listener.
Note: The configuration management and provisioning software are specific to a vendor
architecture.

REASON:  Change PNF to VNF or PNF. Change requirement to only apply if Basic Authentication is used.