Testing with --target=FOO

[Ben Elliston]

>>>>> "Frank" == Frank Ch Eigler <fche@redhat.com> writes:

  Frank> Which ones?  Back when we only had an arm model to work with, we
  Frank> were expedient and hard-coded tests to use that.  But now, with
  Frank> many more ports in-house, those old tests should generally be
  Frank> made cpu-independent, or replicated in multiple cpu-dependent
  Frank> copies, as appropriate.

I have made a start at making the sidcomp.cfgroot tests more
cpu-independent.  In many cases, these tests just use an arm7t cpu
where any other component would be equally suitable.

I've checked in a few testsuite fixes.  More to come.

Ben