ra_serf: When we see a 5xx that also closes the socket (the default behavior), ensure that we reset our connection.
ra_serf: When we see a 5xx that also closes the socket (the default behavior),
ensure that we reset our connection.

Combined with serf r1036, fixes commit test #27 (commit with conflicts and
check txn in repo).  (We weren't deleting the activity after the error.)

* subversion/libsvn_ra_serf/util.c
  (handler_default): If we see a 5xx and a Conn: Close, reset our connection
  so it can be reused later.

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