SOL005: unique notification endpoint for NSD mgmt and NS performance mgmt interfaces + fixes in response type descriptions

SOL005: Consolidation of common data types, endpoint parameters, and responses in VNF PM and NS LCM.

SOL005: API versions endpoint included ad endpoint type + API version updated to 1.2.0 + PDF references updated

    SOL005_138/139: Updated type of notification attributes to "NotificationLink" rather than "Link" in "PkgmLinks" data type (VNF PM)

SOL005_137: Attribute "subscriptionId" has now cardinality of 1 (was 0..1) in "VnfPackageChangeNotification" data type (VNF PM)

SOL005_136: Attribute "subscriptionId" has now cardinality of 1 (was 0..1) in "VnfPackageOnboardingNotification" data type (VNF PM)

SOL005_131: Clarification is added about the response body in case of 200 OK to GET method on "Individual VNF package" (VNF PM)

SOL005_121/122/123/124/125: Updated type of notification attributes to "NotificationLink" rather than "Link" (NS FM)