Early staging for library makefile use (patch 2 of many)

Fix for broken URLs and delayed problem manifestations.

overview/troubleshooting.rst
----------------------------
  o (make test) Wireshark protocol-dissectors returned a 500 error.
  o URL accessible when used interactively.
  o Workaround: morph the url into an emphasized statement.

howto/code/linting.rst
----------------------
  o Modify lint target URLs to reference repo:onf-make VS repo:voltha-docs.
  o Update URLs to accommodate temp renaming makefiles/ to makefiles-orig.

makefiles-orig/lint/json.mk
---------------------------
  o Exclusions for delayed error condition.
  o make lint runs successfully after a clean checkout.
  o lint begins failing after targets (build, test, etc) checkout external
    repos, create *venv* and generate documents.
  o ie: cord-tester/venv_cord
    + [todo] include makefiles/virtualenv/include.mk
  o Add simple directory exclusions for now so lint target
    will ignore generated content.

Change-Id: Idea00c999f6bf8bfffd8192240005532e13baafe
diff --git a/makefiles-orig/lint/json.mk b/makefiles-orig/lint/json.mk
index 1deeaba..f24dba6 100644
--- a/makefiles-orig/lint/json.mk
+++ b/makefiles-orig/lint/json.mk
@@ -42,7 +42,20 @@
 ## Intent: exhaustive json syntax checking
 ## -----------------------------------------------------------------------
 json-find-args := $(null)
+
+## -----------------------------------------------------------------------
+## [TODO] makefile migration enhancement
+## Move switches into makefiles/onf-make/makefiles/lint/json/excl.mk
+## -----------------------------------------------------------------------
+## makefiles/virtualenv/index.mk could also append $(venv-name) to a
+## global directory exclusion list for central maintenance.
+## -----------------------------------------------------------------------
 json-find-args += -name '$(venv-name)'
+
+## Migrate into makefiles/local/lint/json/excl.mk
+json-find-args += -o -name '*venv*'
+json-find-args += -o -name '_build'
+
 lint-json-all:	
 	$(HIDE)$(MAKE) --no-print-directory lint-json-install