[PATCH] issue 2154 - svn blame on a directory over DAV does not return gracefully

Attached is a patch, including a test case, for issue 2154. make check
passes.

There are still some unanswered questions which somebody with greater
familiarity with mod_dav_svn may be able to answer. Or I'll re-visit
this once I've looked into a few more mod_dav issues. The question is
why the goto cleanup: blows away the 500 status and picks up the default
200 status. I also don't see why a 0 is being returned in the http body.

Also, svn_path_local_style in svn_repos_get_file_revs doesn't seem to
convert "/A" to "A".

Thanks to a bunch of people, Karl, Madan, and Ben, for their help with
questions and testing.

Regards
Sameer

Resolve issue 2154 - svn blame on a directory. Over DAV, this
fails with an "invalid XML" error message. This patch fixes that.

* subversion/tests/clients/cmdline/blame_tests.py
  (blame_directory): Add new test to blame a directory
  test_list: Added blame_directory test

* subversion/mod_dav_svn/file_revs.c
  (dav_svn__file_revs_report): Change to return immediately without
  cleanup if svn_repos_get_file_revs() returns an error.

* subversion/libsvn_repos/rev_hunt.c
  (svn_repos_get_file_revs): Add path when generating error message

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