add cord-kafka to the helm-based tests

Change-Id: I86d6ee9b935d5dfb548fb33edf3dabc2088f57c1
diff --git a/jjb/pipeline/all-xos-api-test-helm.groovy b/jjb/pipeline/all-xos-api-test-helm.groovy
index 10eef1e..6e3d346 100644
--- a/jjb/pipeline/all-xos-api-test-helm.groovy
+++ b/jjb/pipeline/all-xos-api-test-helm.groovy
@@ -215,6 +215,9 @@
 
            pushd cord/helm-charts
 
+           helm install -f examples/kafka-single.yaml --version 0.8.8 -n cord-kafka incubator/kafka
+           scripts/wait_for_pods.sh
+
            helm dep up xos-core
            helm install \${helm_install_args} xos-core -n xos-core