Deploys the standalone, cluster and resilient instances with a release
which backs up with qmpbackup 0.51, and asserts they keep running and
migrate after being requested on the software release of the checkout.

The migration tests of the kvm test suite fabricate the state of the old
version, this one goes through a version that produced it.

What both suites need is shared: locating the partitions of an instance
tree, and the tap interface of the outermost partition the tests run in,
as the standalone of the test framework creates none while qemu refuses
to start when given an empty interface name. Only the software release
of a partition is not matched here, as an upgrade changes it.