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>

Makefile.dapper

@@ -0,0 +1,26 @@
+# This Makefile contains the rules required to set up our
+# Dapper-based build environment; it can be copied as-is to
+# other projects (and needs to be copied, it can't be shared
+# via the Dapper image since it's needed to retrieve the image)
+
+.dapper:
+	@echo Downloading dapper
+	@curl -sL https://releases.rancher.com/dapper/latest/dapper-`uname -s`-`uname -m` > .dapper.tmp
+	@@chmod +x .dapper.tmp
+	@./.dapper.tmp -v
+	@mv .dapper.tmp .dapper
+
+invoke_dapper = +./.dapper -m bind make -- $1
+
+%: .dapper
+	@echo Invoking Dapper, MAKEFLAGS=$(MAKEFLAGS)
+	$(call invoke_dapper,$@)
+
+# Ensure that files in the current directory don't hide Dapper targets
+$(wildcard [^M]*): .dapper
+	$(call invoke_dapper,$@)
+
+shell: .dapper
+	./.dapper -m bind -s
+
+.PHONY: shell $(wildcard [^M]*)