Make upgrade rerunnable after an interrupt without needing to use pre-1.7 for cleanup.
Make upgrade rerunnable after an interrupt without needing to use
pre-1.7 for cleanup.

* subversion/libsvn_wc/upgrade.c
  (upgrade_to_wcng): Delete any previous partial upgrade.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@995363 13f79535-47bb-0310-9956-ffa450edef68

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