VNFM returns a "200 OK" response that includes "vnfPkgId"
in the payload body.
Implements: blueprint support-etsi-nfv-specs
Spec: https://specs.openstack.org/openstack/tacker-specs/specs/victoria/enhancement_enhance-vnf-lcm-api-support.html
Change-Id: I944be2390735f4993c56c7630b1de82536d11847
(cherry picked from commit 7439b4e0da)