Fix requirements for broken os-client-config
Fix requirements for broken os-client-config

OCC 1.19.0 breaks all the things. Avoid it.

Change-Id: I721d7c937e4a7a5dd8b0d0abfae1bb696d2b2f00

openstack/python-openstacksdk,openstack-infra/shade,stackforge/python-openstacksdk,openstack/python-openstacksdk,openstack-infra/shade,dtroyer/python-openstacksdk,stackforge/python-openstacksdk,dtroyer/python-openstacksdk