virttest.qemu_devices: Workaround unsupported -drive addr=...

Antient versions of qemu don't support -drive addr=... option.
This workaround logs and ignores setting of addr.

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
Merge pull request #1043 from ldoktor/add_device3

virttest.qemu_devices: Workaround unsupported -drive addr=...