Import makefile edits from repo:voltha-docs

makefiles/include.mk
makefiles/virtualenv/include.mk
makefiles/virtualenv/patches/
makefiles/virtualenv/python_310_migration.sh
--------------------------------------------
  o Add deps and targets to create a python virtualenv
    install patched for local use of v3.10+.

Change-Id: I9a3bf8cdfc9a98f09ac84c97c0246e6194c50d01
diff --git a/makefiles/include.mk b/makefiles/include.mk
index 97ea39a..b6b90a1 100644
--- a/makefiles/include.mk
+++ b/makefiles/include.mk
@@ -41,7 +41,7 @@
 include $(ONF_MAKEDIR)/etc/include.mk        # banner macros
 include $(ONF_MAKEDIR)/commands/include.mk   # Tools and local installers
 
-include $(ONF_MAKEDIR)/virtualenv.mk#        # lint-{jjb,python} depends on venv
+include $(ONF_MAKEDIR)/virtualenv/include.mk#  # python, lint, JJB dependency
 # include $(ONF_MAKEDIR)/patches/include.mk#   # Patch when python 3.10+ in use
 include $(ONF_MAKEDIR)/lint/include.mk