math: Add more details to the test driver output.

Add start and end indicators that identify the test being run in the
verbose output.  Better identify the tests for max errors in the
summary output.  Count each exception checked for each test. Remove
double counting of tests for the check_<type> functions other than
check_float_internal. Rename print_max_error and
print_complex_max_error to check_max_error and check_complex_max_error
respectively since they have side effects.

Co-Authored-By: Carlos O'Donell <carlos@redhat.com>
Reviewed-By: Joseph Myers <josmyers@redhat.com>