Ev2 shims: Add shim wrappers to svnsync.  Several tests still fail.
Ev2 shims: Add shim wrappers to svnsync.  Several tests still fail.

* subversion/svnsync/main.c
  (replay_baton_t): Add a few new members.
  (make_replay_baton): Populate new members.
  (fetch_base_func, fetch_kind_func, fectch_props_func, get_shim_callbacks):
    New.
  (replay_rev_started): Register the callbacks with the ra session.

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