autobuild[sn-devel-144]: intermittent test failure detected

The autobuild test system (on sn-devel-144) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2016-12-21-0031/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2016-12-21-0031/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-144/2016-12-21-0031/samba.stdout
  
The top commit at the time of the failure was:

commit 8989725b67b4510b05a6819f86fc364293b5a814
Author: Andreas Schneider <[email protected]>
Date:   Mon Sep 19 14:40:42 2016 +0200

    s3-rpc_client: Pass NULL as no password
    
    GENSEC expects NULL as no password.
    
    Signed-off-by: Andreas Schneider <[email protected]>
    Reviewed-by: Stefan Metzmacher <[email protected]>
    
    Autobuild-User(master): Stefan Metzmacher <[email protected]>
    Autobuild-Date(master): Tue Dec 20 17:37:56 CET 2016 on sn-devel-144