Python 3 compatibility: Use str.ljust() and str.center() instead of string.ljust() and string.center().
Python 3 compatibility:
Use str.ljust() and str.center() instead of string.ljust() and string.center().

* subversion/libsvn_subr/genctype.py: Use str.ljust() and str.center() instead
   of string.ljust() and string.center().


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@873524 13f79535-47bb-0310-9956-ffa450edef68

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