VOL-1856: onos and apps version to match 1.7/Tech Profile

Also include seba compatable kafka app.
Also update example network-cfg.json to working bbsim example.

Change-Id: I0652d40316f7a3c450f2595d70fe5fb3e90e8cba
diff --git a/Makefile b/Makefile
index d54f4f4..dc782eb 100644
--- a/Makefile
+++ b/Makefile
@@ -59,6 +59,7 @@
 local-onosapps:
 	mkdir -p local_imports/oar
 ifdef LOCAL_ONOSAPPS
+	rm -rf local_imports/oar
 	./get-local-oars.sh
 endif