Followup to r1541790: Don't depend on dav_svn_split_uri() implementation details.

* subversion/mod_dav_svn/repos.c:
  (get_resource): Move the code to detect if a request is for the parentpath
    list and move it to...

* subversion/mod_dav_svn/util.c,
  subversion/mod_dav_svn/dav_svn.h:
  (dav_svn__is_parentpath_list): New function.

* subversion/mod_dav_svn/mod_dav_svn.c:
  (dav_svn__translate_name): Use dav_svn__is_parentpath_list() instead
    of depending on the dav_svn_split_uri() to not set repos_basename
    if no repository is specified in a parentpath setup.



git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1542042 13f79535-47bb-0310-9956-ffa450edef68