Following up on r1452792, handle http status codes in a few more code paths.

* subversion/libsvn_ra_serf/getlocks.c
  (svn_ra_serf__get_lock): Use svn_ra_serf__error_on_status to handle
     several http error codes, but not 404.

* subversion/libsvn_ra_serf/options.c
  (svn_ra_serf__v2_get_youngest_revnum): Use svn_ra_serf__error_on_status.

* subversion/libsvn_ra_serf/property.c
  (svn_ra_serf__wait_for_props): Compose errors instead of cleaning one.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1452870 13f79535-47bb-0310-9956-ffa450edef68