Add golint and gocyclo smaller make targets

Also fix the broken fmt and reportcard ones:

Recursive variable 'SOURCE_DIRS' references itself (eventually).

Makefile

@@ -76,7 +76,7 @@ MINIKUBE_BUILD_TAGS := container_image_ostree_stub containers_image_openpgp
 MINIKUBE_INTEGRATION_BUILD_TAGS := integration $(MINIKUBE_BUILD_TAGS)
 
 CMD_SOURCE_DIRS = cmd pkg
-SOURCE_DIRS = $(SOURCE_DIRS) test
+SOURCE_DIRS = $(CMD_SOURCE_DIRS) test
 SOURCE_PACKAGES = ./cmd/... ./pkg/... ./test/...
 
 # $(call DOCKER, image, command)
@@ -223,6 +223,14 @@ fmt:
 vet:
 	@go vet $(SOURCE_PACKAGES)
 
+.PHONY: golint
+golint:
+	@golint -set_exit_status $(SOURCE_PACKAGES)
+
+.PHONY: gocyclo
+gocyclo:
+	@gocyclo -over 15 `find $(SOURCE_DIRS) -type f -name "*.go"`
+
 out/linters/golangci-lint:
 	mkdir -p out/linters
 	curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b out/linters $(GOLINT_VERSION)