ipatests: update definitions for custom COPR nightlies
Vagrant templates for `pki-`, `389ds-` and `testing-` are no longer
needed after feature added by https://github.com/freeipa/freeipa-pr-ci/pull/463.
This updates the test definitions to use PR-CI's custom arguments with
standard `ci-master-f36` vagrant box.
Signed-off-by: Armando Neto <abiagion@redhat.com>
Reviewed-By: Francisco Trivino <ftrivino@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>