Updated openstack/openstack
Project: openstack/requirements  1c4e856dc4d958277589f61e8149e06eb6e692eb

Update redis library to >=2.10.0

Tooz is using this library and is depending on a version that
has exceptions added in 2.10.0 so in order to avoid conflicts
we should bump up the redis to be at least that version. This
avoids mishaps later with other users that could be depending
on versions <2.10.0

Change-Id: Ia8e58f8cb6a19d2a12846a6a8f0e2e313d48f9a0