Fix the VNFFG update osc command
Fix the VNFFG update osc command

VNFFG update osc command misuse create_vnffg function.

Change-Id: If3fbb077936c6c698744210384373b77d5986e64
Implements: blueprint tacker-support-python-openstackclient
Closes-Bug: #1754793

stackforge/python-tackerclient,stackforge/python-tackerclient,openstack/python-tackerclient,openstack/python-tackerclient