Open 2012.1.2 development

Bump version to 2012.1.2 to formally open development of the next
Essex stable update release.

See http://wiki.openstack.org/StableBranchRelease

Change-Id: Id20de09f981f5389afbb9622ade9de7d4f3fd015

setup.py

@@ -56,7 +56,7 @@ def run(self):
 write_requirements()
 
 setup(name='keystone',
-      version='2012.1.1',
+      version='2012.1.2',
       description="Authentication service for OpenStack",
       license='Apache License (2.0)',
       author='OpenStack, LLC.',