Support for Partitioned/Clustered Schedulers

[Sebastian Huber]

This patch set adds basic support for partitioned/clustered schedulers.

http://www.rtems.org/wiki/index.php/SMP#Clustered_Scheduling_2

Not all low level parts are included, but the high-level API is complete.

Changes after review of preliminary patches:

I renamed rtems_scheduler_get_processors() to
rtems_scheduler_get_processor_set().

I removed the rtems_scheduler_ident_by_index() function.

The default scheduler names changed.

I introduced a new object API OBJECTS_FAKE_OBJECTS_API to generate the
scheduler identifiers.