Upgrade WebOb to 1.2.3

The version of WebOb being used in OpenStack was more than
1 year old. This change updates to the latest stable release.

Upgrading WebOb resolves a version conflict between OpenStack
and Pecan, the web framework used by the Ceilometer team for
version 2 of the ceilometer API.

Refer to http://docs.webob.org/en/latest/news.html
for the list of changes between 1.0.8 and 1.2.3.

bug 1092227

Change-Id: I2c8e95ecc3b69b40fd9f8d2f801e75c17b07ed59
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>

tools/pip-requires

@@ -1,5 +1,5 @@
 PasteDeploy==1.5.0
-WebOb>=1.0.8
+WebOb==1.2.3
 eventlet
 extras
 greenlet>=0.3.1