We recently noticed inconstancy in OSTree version for ppc64le ISO in compose
https://kojipkgs.fedoraproject.org/compose/updates/Fedora-29-updates-20181112.0/compose/ .
OSTree version for ppc64le ISO was 29.20181111.0 while expected was 29.20181112.0.

This patch (available in email attachment) is to fix inconsistency in OSTree
version which may occur during AH artifacts creation.
pull ostree content from repo https://kojipkgs.fedoraproject.org/compose/atomic/repo/
instead of https://kojipkgs.fedoraproject.org/atomic/repo/.