On the '1.7.x-issue4257' branch: fix issue #4257 ("neon get_dir leads
to bogus NODES rows").

* subversion/libsvn_ra_neon/ra_neon.h,
* subversion/libsvn_ra_neon/util.c
  (svn_ra_neon__get_url_path): New helper function.

* subversion/libsvn_ra_neon/fetch.c
  (svn_ra_neon__get_dir): Use svn_ra_neon__get_url_path() in the HEAD
    lookup case to ensure that we aren't comparing apples (full URLs) to
    oranges (URL paths).

Patch by: philip
          (Tweaked be me.)

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.7.x-issue4257@1454459 13f79535-47bb-0310-9956-ffa450edef68