[VOL-5308] - bbsim test failure

Makefile
--------
  o Temporary flag USE_LF_MK=1 added to enable library repo:onf-make use.
  o Default behavior will use legacy makefiles from  repo:bbsim/makefiles/.
  o Fixed typo on line 76

lf/include.mk
makefiles/
-------------
  o Transition bridge for using repo:onf-make.
  o Define variable legacy-mk= as bbsim/makefiles/
  o Replace path variable $(MAKEDIR=) with $(legacy-mk).
  o Replace variable $(ONF_MAKEDIR=) with $(legacy-mk).
  o These edits help break dependency on non-library makefiles/ directory.
    allowing repo:onf-make to be used as a transparent replacement.

Change-Id: Ida8c020384cf78ddf19fa6375702429d992d10a1
Signed-off-by: Joey Armstrong <jarmstrong@linuxfoundation.org>
diff --git a/makefiles/lint/python/include.mk b/makefiles/lint/python/include.mk
index b052d84..5eb4e66 100644
--- a/makefiles/lint/python/include.mk
+++ b/makefiles/lint/python/include.mk
@@ -32,8 +32,8 @@
 ## -----------------------------------------------------------------------
 ## -----------------------------------------------------------------------
   ifndef NO-LINT-PYTHON
-    include $(ONF_MAKEDIR)/lint/python/flake8.mk
-    include $(ONF_MAKEDIR)/lint/python/pylint.mk
+    include $(legacy-mk)/lint/python/flake8.mk
+    include $(legacy-mk)/lint/python/pylint.mk
   endif
 
   mk-include--onf-lint-python := true