Fix a slew of test failures caused by the sudden appearance of plaintext password storage warnings.
Fix a slew of test failures caused by the sudden appearance of
plaintext password storage warnings.

* subversion/tests/cmdline/svntest/main.py
  (create_config_dir): When no custom 'servers' config file contents
    are provided, make sure the default contents written include the
    'store-plaintext-passwords=yes' and 'store-passwords=yes' options.

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