if you are running SOC6 aka SUSE OpenStack Cloud 6
make sure to not install python-2.7.13-27.1 yet because we just found it causes problems with neutron server processes no more starting.
A fixed version will be coming soon.
if you already installed it, and maybe even got broken network from openvswitch, the workaround is to do
ovs-vsctl del-fail-mode br-fixed
ovs-vsctl del-fail-mode br-public
zypper in -f python-base-2.7.9-24.2 python-2.7.9-24.2
and allow it to downgrade some more packages
A controller node reboot is the easiest way to get all required services started again in the right order.