* Fix prow set up
* e2e changes
* removing openshift artifacts
* accelerated networking rationalization, with tests
* remove additional sed statements for ip-masq addons
* Update go-dev tools image for go 1.11.2
* remove unused azconst methods
* add support PB6 vm skus
* update azure_const unit test
* update tiller versions in the recent versions of kubernetes
* VSTS VHD pipeline hosted ubuntu pool
* azureconst cruft
* scale: persist scale down in api model
* Add support for Kubernetes 1.11.5
* Fix docker-engine install in VHD pipeline
* remove IsOpenShift from E2E
* replace premature aks-engine reference
* make validate-headers doesn’t exist, revert rename
* update go-dev-tools image
See https://github.com/deis/docker-go-dev/releases/tag/v1.15.0
* Fix new go vet errors in go 1.11
* Update go-dev image to 1.15.1 for goimports fix.
The "goimports" binary/plugin needed to be built with go 1.11.
* Update go-dev image to 1.16.0 for parity with AKS
* Test just headers of SSH keys
Go 1.11 now randomizes rsa.GenerateKey to prevent exactly this
type of implementation-specific test.
* Update go-dev image to 1.17.0 for party with AKS
* Add private key length and validation tests
Jack Francis
Matt Boersma
Patrick Lang