Add RoutingHelper to allow IP communication in experiments

Change-Id: I267e264b2583909a47229279076655a8080ace22
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..be5de0f
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+python-igraph
\ No newline at end of file