make help target cleanup

Makefile
makefiles/help/include.mk
makefiles/lint/include.mk
makefiles/lint/makefile.mk
makefiles/lint/.........mk
-------------------------
  o Implement topic help:: using 3 distinct targets.
  o help-summary - displays one-line topic help.
  o help-simple  - displays common topic help (lint, build, test)
  o help-verbose - exhaustive topic help for targets.
  o help (default) help-summary + help-simple (see {gerrit,lint}/help.mk)
  o Align all help text on string '[target]' from make cmd usage.
  o Restore JJB_VERSION ?= 2.8.0 in case of variant conflict with v4.1.0 in use.

makefiles/gerrit/help.mk
makefiles/gerrit/include.mk
---------------------------
  o Add gerrit command line convenience targets.
  o replication-status target shows health of gerrit-to-github mirror.

jjb/voltha-scale.yaml
---------------------
  o Lint cleanups, remove duplicate definitions.

Change-Id: I1c40fc0b5a61e3962e3481f0eae7266c5a6f2b2e
diff --git a/Makefile b/Makefile
index b205054..ecdaebc 100644
--- a/Makefile
+++ b/Makefile
@@ -16,16 +16,15 @@
 # -----------------------------------------------------------------------
 
 # Makefile for testing JJB jobs in a virtualenv
-.PHONY: all clean help test
-.DEFAULT_GOAL := all
-# .DEFAULT_GOAL := lint-jjb
+.PHONY: help clean help test
+.DEFAULT_GOAL := help
 
 ##-------------------##
 ##---]  GLOBALS  [---##
 ##-------------------##
 TOP          ?= .
 MAKEDIR      ?= $(TOP)/makefiles
-export SHELL := bash -e -o pipefail
+export SHELL := bash -e -o pipefail#    # [TODO] remove once set -u cleaned up
 
 ##--------------------##
 ##---]  INCLUDES  [---##
@@ -42,6 +41,8 @@
 	mkdir $@
 
 ## -----------------------------------------------------------------------
+## Intent: Sanity check incoming JJB config changes.
+##   Todo: Depend on makefiles/lint/jjb.mk :: lint-jjb
 ## -----------------------------------------------------------------------
 # lint : lint-jjb
 lint-tox:
@@ -61,6 +62,7 @@
 clean:
 	$(RM) -r $(JOBCONFIG_DIR)
 
+## Display make help late
 include $(ONF_MAKE)/help/trailer.mk
 
 # [EOF]