Add the command table sentinel for 'svnauthz'.  Follow-up to r1428209.

* tools/server-side/svnauthz.c
  (cmd_table): Add the command table sentinel.

Patch by: Evgeny Kotkov <evgeny.kotkov{_AT_}visualsvn.com>


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1435252 13f79535-47bb-0310-9956-ffa450edef68