Support for Voltha 2.x with only 1 UNI per ONU

With this patch only one UNI per ONU is supported.
The UNI has to be the one with portname (in ONOS) that ends with '-1'.
All the other ports with related events coming from ONOS on the Kafka
topic onu.events are not considered.

Change-Id: I8c250a9a30e53cfbdf41c9810917c92dd95bcbad
diff --git a/VERSION b/VERSION
index 3eefcb9..336c367 100755
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.0
+1.1.0-dev