Use the node child walking function introduced in r39039 to invalidate wcprops within libsvn_client.
Use the node child walking function introduced in r39039 to invalidate wcprops
within libsvn_client.

* subversion/libsvn_client/ra.c
  (callback_baton_t): Remove unneeded access baton member.
  (invalidate_wcprop_for_entry): Rewrite as a node walker callback, using the
    provided absolute path.
  (invalidate_wc_props): Call the new node walking function, and drop the
    need for an access baton.
  (svn_client__open_ra_session_internal): Don't worry about initializing the
    access baton baton member.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion