Fix OLM install modes

Currently with OLM we claim to support `OwnNamespace`, `SingleNamespace`
and `AllNamespaces` install modes.

However only `OwnNamespace` works properly when deploying OpsManager.
With other install modes the operator is able to reconcile resources
and create `StatefulSets` for the workloads OpsManager.
However pods never become healthy because only operator's own namespace
has a required `ServiceAccount`.

With this change we make the relevant `ServiceAccount`
managed by OLM. This means, the service account and relevant roles
will be created in all the required namespaces.

Author: m1kola

Makefile

@@ -388,6 +388,7 @@ bundle: manifests kustomize
 	operator-sdk generate kustomize manifests -q
 	$(KUSTOMIZE) build config/manifests | operator-sdk generate bundle -q --overwrite --version $(VERSION) $(BUNDLE_METADATA_OPTS)\
 		--channels=stable --default-channel=stable\
+		--extra-service-accounts mongodb-kubernetes-appdb \
 		--output-dir ./bundle/$(VERSION)/
 	operator-sdk bundle validate ./bundle/$(VERSION)