Switch the FSFS's internal revision file API to the two-pool paradigm.

* subversion/libsvn_fs_fs/rev_file.h
  (svn_fs_fs__open_pack_or_rev_file,
   svn_fs_fs__open_proto_rev_file): Switch to two-pool paradigm.

* subversion/libsvn_fs_fs/rev_file.c
  (open_pack_or_rev_file,
   svn_fs_fs__open_pack_or_rev_file,
   svn_fs_fs__open_proto_rev_file): Switch implementations to two-pool
                                    paradigm.

* subversion/libsvn_fs_fs/cached_data.c
  (open_and_seek_revision,
   open_and_seek_transaction,
   svn_fs_fs__rev_get_root,
   auto_open_shared_file,
   svn_fs_fs__check_rep,
   svn_fs_fs__get_changes): Update callers, none using separate pools.

* subversion/libsvn_fs_fs/index.c
  (svn_fs_fs__l2p_get_max_ids): Same.

* subversion/libsvn_fs_fs/recovery.c
  (recover_get_largest_revision): Same.
  (recover_body): Update caller, using an actual temporary pool.

* subversion/libsvn_fs_fs/pack.c
  (pack_range,
   append_revision): Update callers, using actual temporary pools.

* subversion/libsvn_fs_fs/verify.c
  (compare_l2p_to_p2l_index,
   compare_p2l_to_l2p_index,
   compare_p2l_to_rev): Same.

* tools/server-side/svnfsfs/dump-index-cmd.c
  (dump_index): Same.

* tools/server-side/svnfsfs/load-index-cmd.c
  (load_index): Update caller, does not use a separate pool.

* tools/server-side/svnfsfs/stats-cmd.c
  (open_rev_or_pack_file,
   read_log_rev_or_packfile): Ditto.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1606132 13f79535-47bb-0310-9956-ffa450edef68