ci workaround when running integration tests
ci workaround when running integration tests

Due to an issue fixed in libvirt master we should not consider running
integration tests in parallel.

https://www.redhat.com/archives/libvir-list/2019-July/msg00287.html

Signed-off-by: Sahid Orentino Ferdjaoui <f799991784850b8d4b84e1fdbe797720df9aae1a@canonical.com>

sahid/libvirt-rs