kubeadm: fix golint warnings for redundant ifs

kubeadm: add CurrentKubernetesVersion

add description about namespace for  pod in log

kubeadm: fix golint warnings in package_validator

kubeadm: use T.Run API in app/util/system

Speedup listers for empty selectors

fix kubemark makefile

Fixed the following golint warnigns:
 - package_validator.go:68:1: receiver name should not be an underscore, omit the name if it is unused
 - package_validator.go:89:1: receiver name should be a reflection of its identity; don't use generic names such as "this" or "self"
 - package_validator.go:96:1: receiver name should be a reflection of its identity; don't use generic names such as "this" or "self"
 - package_validator.go:119:1: receiver name should be a reflection of its identity; don't use generic names such as "this" or "self"

Used T.Run API for kubeadm tests in app/util/system

Filter resources logged by e2e ns debugging

VolumeDevices validation and tests

Stop checking VolumeScheduling feature gate

Signed-off-by: Serguei Bezverkhi <sbezverk@cisco.com>

EmptyVolume SizeLimit validation and tests

move resource_quota e2e tests to apimachinery folder

kubeadm: use T.Run API in test/cmd

Signed-off-by: Serguei Bezverkhi <sbezverk@cisco.com>

When golint is run against kubeadm it reports severel warnings like

    redundant if ...; err != nil check, just return error instead.

Fix the warnings by just returning error.

Used T.Run API for kubeadm tests in cmd/kubeadm/test/cmd/

This should improve testing output and make it more visible
which test is doing what.

[kube-proxy/ipvs] Protect Netlink calls with a mutex

Replaced hardcoded "v0.13.0" strings with CurrentKubernetesVersion variable.

This should help with a regular release version bumps.

Add pods in the backoff queue to the list of pending pods

Fix goroutine leak of wait.poller

Fix subpath issues with orphaned pod cleanup

Fixup apps/v1 addon manifests

VolumeMode - Update DropDisabled[Alpha]Fields behaviour

AllowVolumeExpansion validation and tests

code cleanup for kubectl config

Fix create secret docker-registry compatibility

PodPriority - Update DropDisabled[Alpha]Fields behaviour 

Signed-off-by: Serguei Bezverkhi <sbezverk@cisco.com>