Rename this header file to later move <t.h> to <rtems/test.h>. The main
feature provided by <rtems/test-info.h> is the output of standard test
information which is consumed by the RTEMS Tester.
Update #3199.
The CONFIGURE_DISABLE_SMP_CONFIGURATION configuration option and
rtems_configuration_is_smp_enabled() were added during the SMP support
development cycle as a workaround to fix some testsuite failures in SMP
configurations. All use cases were replaced with tests for specific
conditions. The configuration option and test macro were undocumented.
Close#3876.
