Add screenshots for:
/clouds/openstack/{cloud_context}/server_group/add /clouds/openstack/{cloud_context}/server_group /clouds/openstack/{cloud_context}/server_group/{openstack_server_group}/delete
Closes #3408933
/clouds/openstack/{cloud_context}/server_group/add /clouds/openstack/{cloud_context}/server_group /clouds/openstack/{cloud_context}/server_group/{openstack_server_group}/delete
Closes #3408933