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

[autobuild]

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-144/2017-12-21-2201/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-12-21-2201/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-12-21-2201/samba.stdout
  
The top commit at the time of the failure was:

commit 6a6f0952a5769628bfa07d1bf1c04bd23d827492
Author: Andrew Bartlett <abartlet at samba.org>
Date:   Thu Dec 21 12:07:46 2017 +1300

    samba-tool domain schemaupgrade: Avoid reindex after every hunk
    
    This takes advantage of the fact that a single LDB operation is atomic
    even inside our transaction and so we can retry it after updating the
    schema.
    
    This makes the smaba-tool domain schemaupgrade take 1m30s compared with 4m4s.
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>
    Reviewed-by: Garming Sam <garming at catalyst.net.nz>
    
    Autobuild-User(master): Garming Sam <garming at samba.org>
    Autobuild-Date(master): Thu Dec 21 08:28:51 CET 2017 on sn-devel-144