prci: Update box used in branch ipa-4-8
Replace template box used, from ci-master-f30 to ci-ipa-4-8-f30.
This affects the cached packages since it's using ipa-4-8 .spec file.
Based on the changes made in freeipa/freeipa-pr-ci#304.
Signed-off-by: Armando Neto <abiagion@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>