Make svnserve CRAM-MD5 authentication work for usernames containing spaces.
Make svnserve CRAM-MD5 authentication work for usernames containing spaces.

* subversion/libsvn_ra_svn/cram.c (svn_ra_svn_cram_server): When parsing the
  client response, search for the space backwards from the end, not
  forwards from the beginning, since the username can contain a space but the
  digest cannot.  (RFC 2222 actually has an example where the username
  contains a space, so it's clear that this is the right thing.)


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@850459 13f79535-47bb-0310-9956-ffa450edef68

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