torture: Place --bootargs parameters at end of -append list

Currently, the kernel boot parameters specified by the kvm.sh --bootargs
parameter are placed near the beginning of the -append list that is
passed to qemu. This means that in the not-uncommon case of a kernel
boot parameter where the last argument wins, the --bootargs list overrides
neither the list in the .boot file nor the additional parameters supplied
by the rcutorture scripting.

This commit therefore places the kernel boot parameters specified by
the kvm.sh --bootargs parameter at the end of qemu's -append list.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

scftorture: Remove extraneous "scf" from per_version_boot_params

There is an extraneous "scf" in the per_version_boot_params shell function
used by scftorture. No harm done in that it is just passed as an argument
to the /init program in initrd, but this commit nevertheless removes it.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

torture: Add scftorture to the rcutorture scripting

This commit updates the rcutorture scripting to include the new scftorture
torture-test module.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>