Add an operator Helm chart

The submariner-operator Helm chart deploys Submariner using the
Submariner operator: it deploys the CRDs, roles, and SAs required to
run the operator and Submariner, then pushes a Submariner CR to
instruct the operator to deploy Submariner.

This patch also adds a Makefile to validate the deployments; run

	make deploy

to test the Helm charts (this will bring up two clusters, install the
broker on one of them and the operator on both, and end with a
connectivity test).

Fixes: #17
Signed-off-by: Stephen Kitt <skitt@redhat.com>

cluster_settings

@@ -0,0 +1,10 @@
+. "${SCRIPTS_DIR}"/lib/source_only
+
+# We need a minimal setup to verify the deployment works
+clusters=('cluster1' 'cluster2')
+cluster_nodes['cluster1']="control-plane worker"
+cluster_nodes['cluster2']="control-plane worker"
+
+cluster_cni=( ['cluster1']="weave" ['cluster2']="weave" )
+
+cluster_subm=( ['cluster1']="true" ['cluster2']="true" )