A new optional --params parameter was added to 'vitrage template add'
and 'vitrage template validate' APIs, to allow assigning actual values
to parameters in Vitrage templates.
Story: 2004056
Task: 29134
Depends-On: Iac163aaf6de0e029893386fc4274421df4706c4e
Change-Id: I144f6cb889be6e97e0d4cbcf1fe5820c8d38c716