svnsync: Reduce number of RA requests.
svnsync: Reduce number of RA requests.

* subversion/svnsync/main.c
  (open_source_session): Retrieve three properties using one 
   svn_ra_rev_proplist() call instead of requesting them one by one.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion