[RFA/mi-testsuite] XFAIL mi*-console.exp

[Andrew Cagney]

> These tests are testing for a feature that exists either nowhere or just in
> simulators and some remote stubs: that the inferior's output goes through
> GDB and is properly encoded by the MI layer.  Since support isn't there for
> many remote debugging stubs or for native, I think these two tests should be
> XFAIL'd.  Does that make sense, Andrew?  If so, OK to commit this?

I believe GDB's rule for XFAIL is something that can't work (due to an 
external constraint) rather than doesn't work (due to a lack of code).

Hence it was marked as a known bug rather than a limitation.

Andrew