test/rauc.t: use good-bundle.raucb from tmpfs for rauc install
test/rauc.t: use good-bundle.raucb from tmpfs for rauc install

This allows us to test chown in qemu, as that's not supported on the 9p host
filesystem.

Signed-off-by: Bastian Krause <591dbcb2d48f405f0cb405f5aa6519451f40ad30@pengutronix.de>

rauc/rauc,rauc/rauc,rauc/rauc,ejoerns/rauc,ejoerns/rauc,jluebbe/rauc,ejoerns/rauc,jluebbe/rauc,jluebbe/rauc