Use stream API to write packed revision properties manifest file during property modification, while still use apr_file_t for flush to disk operations.
Use stream API to write packed revision properties manifest file during
property modification, while still use apr_file_t for flush to disk
operations.

This slightly increase memory usage since svn_stream_printf() copies string 
in provided pool, but revision properties manifest files usually not that
big to cause out of memory issues.

* subversion/libsvn_fs_fs/revprops.c
  (write_packed_revprop): Wrap stream around apr_file_t and use
   svn_stream_printf() to generate revision properties manifest file.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1683330 13f79535-47bb-0310-9956-ffa450edef68

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