ra_serf: Don't wait for the timeout to deal with 204/304's without a body.
ra_serf: Don't wait for the timeout to deal with 204/304's without a body.

Seen with commits against httpd's without an ErrorDocument for 204/304 (such as
stock Ubuntu installs).

Requires r1082 of serf to propogate the 204/304 correctly.

* subversion/libsvn_ra_serf/util.c
  (handle_response): Support a 204/304 properly instead of waiting forever.

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