Misc cleanups, add installer for lint-groovy

makefiles/npm/README.md
makefiles/npm/include.mk
makefiles/npm/nvm.mk
makefiles/npm/npm.mk
-------------------------
  o Genreate targets and deps for installing tools nvm, npm and npm-groovy-lint.
  o Tools are intended for interactive use.
  o npm-groovy-lint is a dependency for the lint-groovy target

config.mk
.gitignore
----------
  o Add exclusion lf/onf-make for repo:onf-make git submodule.
  o Add exclusion for .tmp (makefiles/nvm/nvm.mk)

makefiles/lint/groovy/groovy.mk
makefiles/lint/groovy/include.mk
makefiles/lint/groovy/install.mk
--------------------------------
  o Update targets to latest lint-{language}-{all,mod,src} syntax.
  o Installer updated to depend on npm/nvm.mk target 'npm-groovy-install'.

makefiles/lint/make/makefile.mk
makefiles/lint/json.mk
makefiles/lint/python/flake8.mk
makefiles/lint/shell/shellcheck.mk
makefiles/lint/yaml.mk
------------------------
  o Simplify find command exclusions.
  o Use "-not -path [p]" in place of "( -name p ) -prune".

makefiles/main/tempdir/tempdir.mk
---------------------------------
  o Fixed a typo $(HELP) -> $(HIDE)

makefiles/lint/doc8/doc8.ini
-------------------------------
  o Add directory exclusions from onf-excl-dir=.
  o Remove txt from the list of file extensions to check
    repo:voltha-docs is the only repo with *.txt files that contain
    restructuredText so add the extension in the local per-repository
    config.

Signed-off-by: Joey Armstrong <jarmstrong@linuxfoundation.org>
Change-Id: Ia2e091d812af82063c79ed855bc7dd4f5ec8f706
diff --git a/makefiles/main/tempdir/tempdir.mk b/makefiles/main/tempdir/tempdir.mk
index f854139..4d9c2c7 100644
--- a/makefiles/main/tempdir/tempdir.mk
+++ b/makefiles/main/tempdir/tempdir.mk
@@ -80,7 +80,7 @@
 sterile ::
 
     # Create a reference file to remove lingering stale directories
-	$(HELP)touch --date "$(sterile-timestamp)" "$(lf-mk-tmp-create)-stale"
+	$(HIDE)touch --date "$(sterile-timestamp)" "$(lf-mk-tmp-create)-stale"
 
 	$(HIDE)find '$(dir $(lf-mk-tmp))' -maxdepth 1 -name 'repo-LF-make*' -type d -print0 \
 	   | $(xargs-cmd0) -I'{}' find {} -name '.exists' -not -newer "$(lf-mk-tmp-create)-stale" -print0 \