Update version string to follow new convention

Since adopting branchless we've moved to a different "release" model
were we just tag the tree at set points. We're using an incrementing
integer to name these tags. Since the first tag, 1 was pushed to
correspond with the start of branchless tempest. The current working
tag is 2.

Change-Id: I93be84da9bf2a09e9ca9c2f4231f1a4a75da3af9
diff --git a/setup.cfg b/setup.cfg
index f4aa3e1..14e1913 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = tempest
-version = 2014.1
+version = 2
 summary = OpenStack Integration Testing
 description-file =
     README.rst