Followup to r34653: we should only autoupgrade to 1.3-era formats, not 1.4-era formats.
Followup to r34653: we should only autoupgrade to 1.3-era formats, not
1.4-era formats.

* subversion/libsvn_fs_base/fs.c
  (base_open): Only autoupgrade to format 1 if the format isn't existant.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@874730 13f79535-47bb-0310-9956-ffa450edef68

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