In FSX, add checksums to the packed revprop files.
In FSX, add checksums to the packed revprop files.

Most of this is done by reusing code already written for the checksummed
manifest file.

* subversion/libsvn_fs_x/revprops.c
  (write_packed_data_checksummed): Factored out from ...
  (write_manifest): ... this.
  (read_packed_data_checksummed): Factored out from ...
  (read_manifest): ... this.
  (parse_packed_revprops,
   repack_revprops,
   copy_revprops): Call the new checksumming I/O functions for svn_packed_*.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1719717 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion