Ideally this test should not exists in Avocado-vt as kvm-unit-tests are
dynamic and more and more are added each day. Anyway as it exists let's
limit it to x86 only as it defines x86 variants.

Those who want to run kvm-unit-tests please use pure Avocado instead.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

A frequent request we've got from users is that the name
'kvm' makes assumptions that are not true for a lot of
the use cases of the test suite. Then let's rename
the subtest 'kvm' to 'qemu', making it more accurate.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

For tests that are specific to one virt type, and are hosted on
that virt type directory, make the virt_test_type a non requirement
by auto generating it.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

In order to have self describing tests, split the original
subtests.cfg in several per test files, and create subtests.cfg
out from this information.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>