Fix kubectl installation (#799)

* Fix kubectl installation

* Fix kubectl installation

* Add --client flag

* Fix for ubuntu 16.04

* Move kubectl apt packages installation to basic.sh

* Combined separated scripts for kubectl installation to one

* Minor fix

* Remove apt-transport-https package from basic.sh

* Delete helm init

images/linux/scripts/installers/kubernetes-tools.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+################################################################################
+##  File:  kubernetes-tools.sh
+##  Desc:  Installs kubectl, helm
+################################################################################
+
+# Source the helpers for use with the script
+source $HELPER_SCRIPTS/document.sh
+source $HELPER_SCRIPTS/apt.sh
+
+## Install kubectl
+curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
+touch /etc/apt/sources.list.d/kubernetes.list
+
+# Based on https://kubernetes.io/docs/tasks/tools/install-kubectl/, package is xenial for both OS versions.
+echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | tee -a /etc/apt/sources.list.d/kubernetes.list
+apt-get update
+apt-get install -y kubectl
+
+# Install Helm
+curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
+
+# Run tests to determine that the software installed as expected
+echo "Testing to make sure that script performed as expected, and basic scenarios work"
+if ! command -v kubectl; then
+    echo "kubectl was not installed"
+    exit 1
+fi
+
+if ! command -v helm; then
+    echo "helm was not installed"
+    exit 1
+fi
+
+# Document what was added to the image
+echo "Lastly, documenting what we added to the metadata file"
+DocumentInstalledItem "kubectl ($(kubectl version --client --short |& head -n 1))"
+DocumentInstalledItem "helm ($(helm version --short |& head -n 1))"