SEBA-497 delayering, Makefile, and tox for onos-synchronizer

Change-Id: I849b307330a6fd5a5de5489d8f2db804a02acead
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..e039eea
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+xossynchronizer~=3.0.1
+xosapi~=3.0.1
+xoskafka~=3.0.1