CLOUDSTACK-2787: updateVpcOffering should have id as a required

without the id you cannot update a VPC offering. The docs for API will
go wrong and Marvin tests using update VPC will fail.

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
Temporarily disabling some of the tests that are failing.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cloudstack