test/Makefile: fix fsimg driver name
test/Makefile: fix fsimg driver name

Not sure where "loop" came from. It was always "fsimg".

Signed-off-by: Kir Kolyshkin <c0159612b0ef32139322233232df1a0d189c4b9b@openvz.org>

kolyshkin/mosaic,xemul/mosaic,kolyshkin/mosaic,xemul/mosaic,xemul/mosaic,kolyshkin/mosaic