Remove unused code from Makefile

Serves also as a check that OpenShift CI is properly configured.

Author: sutaakar

Makefile

@@ -30,13 +30,6 @@ defaults:
 
 	gofmt -w $(DEFAULTS_TEST_FILE)
 
-## Tool Binaries
-CONTROLLER_GEN ?= $(LOCALBIN)/controller-gen
-
-## Tool Versions
-CONTROLLER_TOOLS_VERSION ?= v0.9.2
-
-
 ## Location to install dependencies to
 LOCALBIN ?= $(shell pwd)/bin
 $(LOCALBIN):
@@ -56,12 +49,3 @@ imports: openshift-goimports ## Organize imports in go files using openshift-goi
 .PHONY: verify-imports
 verify-imports: openshift-goimports ## Run import verifications.
 	./hack/verify-imports.sh $(OPENSHIFT-GOIMPORTS)
-
-.PHONY: controller-gen
-controller-gen: $(CONTROLLER_GEN) ## Download controller-gen locally if necessary.
-$(CONTROLLER_GEN): $(LOCALBIN)
-	test -s $(LOCALBIN)/controller-gen || GOBIN=$(LOCALBIN) go install sigs.k8s.io/controller-tools/cmd/controller-gen@$(CONTROLLER_TOOLS_VERSION)
-
-.PHONY: manifests
-manifests: controller-gen ## Generate RBAC objects.
-	$(CONTROLLER_GEN) rbac:roleName=manager-role webhook paths="./..."