On the fsx-id branch: Remove the svn_fs_t type from the internal utils API.

* subversion/libsvn_fs_x/util.h
  (svn_fs_x__path_txn_node_props,
   svn_fs_x__path_txn_node_children): Switch parameter ID type to noderev IDs.

* subversion/libsvn_fs_x/util.c
  (svn_fs_x__path_txn_node_props,
   svn_fs_x__path_txn_node_children): Update and simplify implementation.

* subversion/libsvn_fs_x/cached_data.c
  (get_dir_contents,
   svn_fs_x__get_proplist): Update caller.

* subversion/libsvn_fs_x/transaction.c
  (svn_fs_x__set_entry,
   svn_fs_x__set_proplist,
   svn_fs_x__delete_node_revision): Same.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsx-id@1645625 13f79535-47bb-0310-9956-ffa450edef68