Adding timeout to pull_step request to avoid blocking the thread if VOLTHA is not answering

Change-Id: Ia4b34807d3a059c1c35e564c692a2481000a235c
diff --git a/VERSION b/VERSION
index cd57a8b..08ec77d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.5
+2.1.6-dev