CI: fix line merge in CentOS builds
CI: fix line merge in CentOS builds

Looks like I missed one situation with "base/centos: take care of
whitespaces" change.

Change-Id: Id7b5e8ddf23f9ab13806fb02042e76183bcddf05

openstack/kolla,stackforge/kolla,stackforge/kolla,stackforge/kolla,openstack/kolla