Time values were compared as strings. This led to a wrong comparison
result when comparing values one of which is under 100 hours and another is
over 100 hours.

Now when the Arg_comparator::set_cmp_func function sees that both items to
compare are of the TIME type it sets the comparator to the
Arg_comparator::compare_e_int or the Arg_comparator::compare_int_unsigned
functions.


sql/item_cmpfunc.cc:
  Bug#29555: Comparing time values as strings may lead to a wrong result.
  Now when the Arg_comparator::set_cmp_func function sees that both items to
  compare are of the TIME type it sets the comparator to the
  Arg_comparator::compare_e_int or the Arg_comparator::compare_int_unsigned
  functions.
mysql-test/r/type_time.result:
  Added a test case for the bug#29555: Comparing time values as strings may
  lead to a wrong result.
mysql-test/t/type_time.test:
  Added a test case for the bug#29555: Comparing time values as strings may
  lead to a wrong result.