virttest.qemu_devices: Fix warning messages

Fix small typos and improve text clarity.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
virttest.qemu_vm: Readability fixes

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
virt-test: Fix old references to kvm-autotest

This test suite was previously known as kvm-autotest, and
to this day, we have problems with people confunding the
test suite and the larger test framework. So let's contribute
to one more step towards clearing that confusion.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #1175 from autotest/readability-fixes

Readability fixes