This patch cleans up pkg/util/mount/* and pkg/util/volume/* to always
use filepath.Join instead of path.Join. filepath.Join is preferred
because path.Join can have issues on Windows.

Since pkg/util/mount is going to move out of k/k, this exported constant
that is Kubernetes specific needed to move somewhere else. Made sense to
move it to pkg/volume/util.

Update GetDeviceNameFromMount in the mount interface to now take a
pluginMountDir argument, which is volume plugin dir with the global
mount path appended to it already.

Fix shellcheck failures of cluster/clientbin.sh

kubemark: fix and enhance kubemark scripts for IKS

Restrict builds to officially supported platforms

fix azure disk list corruption issue

Use gcr.io/k8s-testimages/bazel-krte during remote execution

Reuse vmssIPConfigurationRE for getting the NIC's resource group

fix shellcheck failures on vet.sh

kubeadm: fix certs renewal during upgrade

os exit when option is true

Kubectl exec support resource/name format

update pull request on vet.sh

use new method to detect cgroup driver

Add OWNERS file for cmd/kube-proxy

Revert "override ETCD_SERVER with https instead http when mTLS is enabled"

Use suggested canonical form for busybox and debian container images

kubeadm: add support for ECDSA keys

Add e2e for connection reset issue

fix spelling error 'retrive' in log

Addresses linter complaint in broken_webhook test file

Adds an integration test for cross group-version server-side apply

support ipv6 in bind address

Fix spell error

kube-proxy: Drop packets in INVALID state

Refeactored framework deployment utils

kubeadm: Introduce v1beta2 config

- fix shell script issues
  - `bx` is deprecated; rename to `ibmcloud`
  - remove unnecessay variable replacement in hollow-node_template.yaml
  - add replacement logic for HOLLOW_KUBELET_TEST_ARGS and HOLLOW_PROXY_TEST_ARGS
  - don't hardcode KUBEMARK_IMAGE_REGISTRY to brandondr96
- make cluster number and spec configurable
  - make number and spec of workers configurable
  - separate NUM_NODES and KUBEMARK_NUM_NODES

Bump minimum docker version to 1.13.1 in kubeadm

Use read lock in ready#check