Update requirements to fix devstack installation

Updating kombu to a newer version also requires a new anyjson
version. If we don't specify the versions here, some of the
other projects install older versions that don't work together
when running under devstack.

Fixes bug #1134575

Change-Id: Idcb45ca4b2c5d947b01a8b75f7906a3df6380ebe
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
Merge "Update requirements to fix devstack installation"