remove deprecated restapi of mpgw to make yeti pass

Change-Id: I1bc611e5079c07b6493ba2b1dc2ef28769b7d053
Reviewed-on: http://reviews.cloudfoundry.org/13417
Tested-by: CI Master <cf-ci@rbcon.com>
Reviewed-by: Nicholas Kushmerick <nicholask@vmware.com>