Fix the interactive conflict resolver 'q' option -- it wasn't quitting.

Found by: markphip

* subversion/svn/conflict-callbacks.c
  (svn_cl__interactive_conflict_baton_t): Add a 'quit' flag.
  (handle_text_conflict,
   handle_prop_conflict,
   handle_tree_conflict,
   handle_obstructed_add): Set the 'quit' flag as well as setting the
    baton's accept_which to 'postpone'.
  (svn_cl__resolve_postponed_conflicts): If the 'quit' flag is set after
    resolving conflicts on a given path, then don't process any more paths.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1447564 13f79535-47bb-0310-9956-ffa450edef68