Return exit(1) instead of exit(0) on failure.
  Allow longer path names using MAXPATHLEN.
  Added option --testcase that skips some failing tests.
  Replaced 'return' with exit(1) in test_frm_bug().
mysqltest.c:
  Let --exec fail if command fails


client/mysqltest.c:
  Let --exec fail if command fails
tests/client_test.c:
  Return exit(1) instead of exit(0) on failure.
  Allow longer path names using MAXPATHLEN.
  Added option --testcase that skips some failing tests.
  Replaced 'return' with exit(1) in test_frm_bug().