Fix Travis IPv6 and add k8s integration testing to CI (#194)

Updating travis yaml file to:
* Force IPv6 to work in their VM environment
* Enable docker (requires VM environment and sudo)
* Run kubernetes integration tests in Travis

middleware/kubernetes/test/00_run_k8s.sh

@@ -7,7 +7,6 @@ K8S_VERSION="v1.2.4"
 
 ARCH="amd64"
 
-
 export K8S_VERSION
 export ARCH
 

middleware/kubernetes/test/10_setup_kubectl.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 PWD=`pwd`
-BASEDIR=`realpath $(dirname ${0})`
+BASEDIR=`readlink -e $(dirname ${0})`
 
 cd ${BASEDIR}
 if [ ! -e kubectl ]; then

middleware/kubernetes/test/15_run_skydns.sh

@@ -2,6 +2,11 @@
 
 # Running skydns based on instructions at: https://testdatamanagement.wordpress.com/2015/09/01/running-kubernetes-in-docker-with-dns-on-a-single-node/
 
+PWD=`pwd`
+BASEDIR=`readlink -e $(dirname ${0})`
+
+cd ${BASEDIR}
+
 KUBECTL='./kubectl'
 
 #RUN_SKYDNS="yes"
@@ -15,7 +20,7 @@ wait_until_k8s_ready() {
 		if [ "${?}" = "0" ]; then
 			break
 		else
-			echo "sleeping for 5 seconds"
+			echo "sleeping for 5 seconds (waiting for kubernetes to start)"
 			sleep 5
 		fi
 	done
@@ -37,3 +42,5 @@ if [ "${RUN_SKYDNS}" = "yes" ]; then
 else
 	true
 fi
+
+cd ${PWD}

middleware/kubernetes/test/20_setup_k8s_services.sh

@@ -1,16 +1,21 @@
 #!/bin/bash
 
+PWD=`pwd`
+BASEDIR=`readlink -e $(dirname ${0})`
+
+cd ${BASEDIR}
+
 KUBECTL='./kubectl'
 
 wait_until_k8s_ready() {
 	# Wait until kubernetes is up and fully responsive
 	while :
 	do
-   	 ${KUBECTL} get nodes 2>/dev/null | grep -q '127.0.0.1'
+   	    ${KUBECTL} get nodes 2>/dev/null | grep -q '127.0.0.1'
 		if [ "${?}" = "0" ]; then
 			break
 		else
-			echo "sleeping for 5 seconds"
+			echo "sleeping for 5 seconds (waiting for kubernetes to start)"
 			sleep 5
 		fi
 	done
@@ -78,3 +83,5 @@ run_and_expose_service webserver test nginx 80
 echo ""
 echo "Services exposed:"
 ${KUBECTL} get services --all-namespaces
+
+cd ${PWD}