Add tests for failing start-commit and pre-commit hooks.
Add tests for failing start-commit and pre-commit hooks.

Patch by: mf

* subversion/tests/cmdline/commit_tests.py
  (start_commit_hook_test, pre_commit_hook_test): New tests.
  (test_list): Run the new tests.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion