VOL-4846 - Added targets lint-chart & lint-helm

README.md
Makefile
makefiles/lint/helm.mk
makefiles/lint/include.mk
=========================
   * In the quest to stop having jenkins failing jobs post checkin for
     content problems added targets lint-chart & lint-helm which invoke
     commands mentioned in README.md.
   * Logic is currently conditional: make lint-helm UNSTABLE=1, failures
     will need to be cleaned up before the command can be run as a default.

Change-Id: I6b445a6600c283b8068201a006792aeacf5407aa
diff --git a/Makefile b/Makefile
index 237898b..1a86238 100644
--- a/Makefile
+++ b/Makefile
@@ -32,6 +32,8 @@
 branch=`cat .gitreview | grep branch | cut -d '=' -f2`
 
 help:: # @HELP Print the command options
+	@echo
+	@echo "[TEST]"
 	@echo "  test                          Sanity check chart versions"
 	@echo
 	@echo "[CHECK: release]"
@@ -73,7 +75,7 @@
 test: test-tags helm-repo-tools # @HELP Makes sure the versions used in the charts are valid
 	@COMPARISON_BRANCH=origin/$(branch) ./helm-repo-tools/chart_version_check.sh
 
-clean: # @HELP Removes all files downloaded to run the tests
+clean :: # @HELP Removes all files downloaded to run the tests
 	$(RM) -r helm-repo-tools
 	$(RM) tagcollisionreject.*