Revert "unpause Gentoo"
Revert "unpause Gentoo"

Our elements in project-config don't appear to support gentoo, revert
until we can fix.

  2018-04-15 15:37:10.971 | Failed to enable unit, unit iptables.service does not exist.

  http://nb01.openstack.org/gentoo-17-0-systemd-0000000757.log

This reverts commit b4950fe8a59b6ddc2e8cb15e2ce2846660d1fc55.

Change-Id: I8568ed46f834feba772b6d1f6a4d0656f80b6005
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

openstack-infra/project-config,openstack-infra/project-config