RHEL support for salt.

Updates to the salt modules so that they run on RHEL.

Change-Id: Ibdbc35594a018a7f49f3785d527e5c1a71a92a2e
Reviewed-on: https://review.openstack.org/23188
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Khai Do <zaro0508@gmail.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins