Make WebOb version specification more flexible

Change the WebOb version to >=1.0.8 as an temporary
measure to allow the actual version update to 1.2.3
to roll out across the projects one at a time without
breaking the integration tests.

Change-Id: I9969b02a6896f7b952301e40e96f0ef6df8f34c0
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
Merge "Make WebOb version specification more flexible"