engine,webadmin: add canDo action to check it qos exists on VnicProfile

Add canDoAction to AddVnicProfileCommand and UpdateVnicProfileCommand
to check that the networkQosId on the commands parameters exists.

Change-Id: I6b4ad298c55ca0f3daef99ff333f800202476eff
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>