As of QEMU 0.9.1 the -drive argument can be used to configure
all disks, so the QEMU driver can assume it is always available
and drop support for -hda/-cdrom/etc.

Many of the tests need updating because a great many were
running without CAPS_DRIVE set, so using the -hda legacy
syntax.

Fixing the tests uncovered a bug in the argv -> xml
convertor which failed to handle disk with if=floppy.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>