Ignore python virtualenv directory

Change-Id: I3937ba4b334340e354e07b82fd8d4aba4a15e498
diff --git a/VERSION b/VERSION
index 7acd1cb..02419fa 100755
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.5.1
+5.5.2-dev1