Port r1673153 to svnbench from svn: request only required directory fields in  'svnbench null-list' to have the same performance as 'svn ls'.
Port r1673153 to svnbench from svn: request only required directory fields in 
'svnbench null-list' to have the same performance as 'svn ls'.

* subversion/svnbench/null-list-cmd.c
  (print_dirent_fields, print_dirent_fields_verbose): New constant variables.
  (svn_cl__null_list): Only request the required fields.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1710638 13f79535-47bb-0310-9956-ffa450edef68

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