Removing old version of local protos and pyvoltha before installing from local package

Change-Id: Ic5a886c167ab203ec8ade49c1c82e46567ab8f74
diff --git a/python/Makefile b/python/Makefile
index ee23590..9e371d0 100644
--- a/python/Makefile
+++ b/python/Makefile
@@ -64,6 +64,7 @@
 local-protos:
 	mkdir -p local_imports
 ifdef LOCAL_PROTOS
+	rm -f local_imports/voltha-protos/dist
 	mkdir -p local_imports/voltha-protos/dist
 	cp ${LOCAL_PROTOS}/dist/*.tar.gz local_imports/voltha-protos/dist/
 endif
@@ -71,6 +72,7 @@
 local-pyvoltha:
 	mkdir -p local_imports
 ifdef LOCAL_PYVOLTHA
+	rm -f local_imports/pyvoltha/dist
 	mkdir -p local_imports/pyvoltha/dist
 	cp ${LOCAL_PYVOLTHA}/dist/*.tar.gz local_imports/pyvoltha/dist/
 endif