Update indentation in setup.cfg.
Update indentation in setup.cfg.

Change-Id: I79d230aa834e58c482fbfa8d72cc1c4abee98fdc
Reviewed-on: https://review.openstack.org/28623
Reviewed-by: Joe Gordon <8a35dafb21031d5c8209b1c0c47aaf0390b56a0e@cloudscaling.com>
Approved: Sean Dague <d7e19930cc1f42c2d0781f4d9e6f1fe5891bf9cf@dague.net>
Reviewed-by: Sean Dague <d7e19930cc1f42c2d0781f4d9e6f1fe5891bf9cf@dague.net>
Tested-by: Jenkins

zancas/hacking,zancas/hacking,openstack-dev/hacking,openstack-dev/hacking,hyakuhei/cleantox,hyakuhei/cleantox