Remove FSFS code that became superfluous when we merged indexes
with rep / pack files.

* subversion/libsvn_fs_fs/cached_data.c
  (svn_fs_fs__check_rep): No need to retry in case of background
                          packs operations anymore.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1606564 13f79535-47bb-0310-9956-ffa450edef68