Changeset 205f794 in rtems-schedsim

Add initial support for make check

+ Enhance run_scenario to run from build tree. Required specification
of both executable and scenario directory

+ check-local stanzas have first cut at which scenarios to run for
each scheduler.

TODO:

+ Verify behavior of each scheduler versus expected output.

+ Ensure list of scenarios executed is complete and appropriate. For
example, SMP schedulers should avoid disable preemption scenarios.