VOL-2769 Update to latest pyvolta to fix omci test result

Change-Id: I9aea199b1a837139349a0c62fbbbe07a3ec4004b
diff --git a/VERSION b/VERSION
index cc6c9a4..a2a044c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.5
+2.3.6-dev