Write update request body to file, to able resend it if needed.
Write update request body to file, to able resend it if needed.

* subversion/libsvn_ra_serf/update.c
  (): Include apr_version.h.
  (report_context_t): Add body_file member to with a file holding request 
   body. Removed buckets member.
  (make_simple_xml_tag): New local helper to generate simple xml tag.
  (set_path, delete_path, link_path): Write xml tags to ctx->body_file 
   instead of constructing buckets.
  (create_update_report_body): New function to create update request 
   body bucket based on file.
  (finish_report): Write xml tags to ctx->body_file. Flush file to disk and
   disable buffering. Use callback to create body bucket on demand.
  (make_update_reporter): Create temporary file for body and write xml 
   tags to the file.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@954797 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion