Update kubekins-test image to include netcat

hack/jenkins/gotest-dockerized.sh

@@ -42,5 +42,5 @@ docker run --rm=true \
   -v "${REPO_DIR}":/go/src/k8s.io/kubernetes \
   -v "${KUBE_JUNIT_REPORT_DIR}":/workspace/artifacts \
   --env REPO_DIR="${REPO_DIR}" \
-  -i gcr.io/google_containers/kubekins-test:0.5 \
+  -i gcr.io/google_containers/kubekins-test:0.6 \
   bash -c "cd kubernetes && ./hack/jenkins/test-dockerized.sh"

hack/jenkins/test-image/Dockerfile

@@ -24,8 +24,12 @@ ENV TERM                    xterm
 WORKDIR /workspace
 
 RUN apt-get -o Acquire::Check-Valid-Until=false update && apt-get install -y rsync
+# file is used when uploading test artifacts to GCS.
+RUN apt-get install -y file
 # libapparmor1 is needed for docker-in-docker.
-RUN apt-get install -y file libapparmor1
+RUN apt-get install -y libapparmor1
+# netcat is used by integration test scripts.
+RUN apt-get install -y netcat-openbsd
 RUN mkdir -p /go/src/k8s.io/kubernetes
 RUN ln -s /go/src/k8s.io/kubernetes /workspace/kubernetes
 

hack/jenkins/test-image/Makefile

 all: push
 
-TAG = 0.5
+TAG = 0.6
 
 container:
 	docker build -t gcr.io/google_containers/kubekins-test .