support/testing/tests/fs/test_ext: add missing "format" option for Qemu
Will avoid the following warning:
WARNING: Image format was not specified for
'/home/thomas/projets/outputs/TestExt3/images/rootfs.ext3' and
probing guessed raw. Automatically detecting the format is
dangerous for raw images, write operations on block 0 will be
restricted. Specify the 'raw' format explicitly to remove the
restrictions.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>