Some deprecation cleanup in ra_svn.h:  Add DEPRECATED marker where it
was missing and update callers where necessary.

* subversion/include/svn_ra_svn.h
  (svn_ra_svn_create_conn2): add missing deprecation maker
  (svn_ra_svn_drive_editor2): add missing "@since" spec
  (svn_ra_svn_drive_editor): deprecate old API

* subversion/svnserve/serve.c
  (commit): use newer API

Found by: julianfoad


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1466913 13f79535-47bb-0310-9956-ffa450edef68