Incorporate a few suggested followups to r37513.
Incorporate a few suggested followups to r37513.

* subversion/libsvn_wc/upgrade.c
  (convert_wcprops): Fetch the dir_abspath directory, instead of constructing
    it.
  (svn_wc__upgrade_format): Update some comments, a conditional, and don't
    invoke loggy.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@877661 13f79535-47bb-0310-9956-ffa450edef68

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