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-144/2016-07-21-0328/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2016-07-21-0328/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-144/2016-07-21-0328/samba.stdout
  
The top commit at the time of the failure was:

commit a464a897f346a3296e30a5920509922efb4949c1
Author: Garming Sam <garming at catalyst.net.nz>
Date:   Fri Jul 15 14:29:02 2016 +1200

    samba-tool: Speed up all samba-tool commands
    
    This in particular helps the docs.py test halve in time (at least on my machine)
    
    NOTE: The removal of enable_null_tracking is required because we are no
    longer importing join.py in every single samba-tool invocation. Without
    removing this line, memory would be hanging from both the actual NULL
    context and the talloc_null_context (causing a segfault at system_exit).
    
    Signed-off-by: Garming Sam <garming at catalyst.net.nz>
    Reviewed-by: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
    
    Autobuild-User(master): Garming Sam <garming at samba.org>
    Autobuild-Date(master): Wed Jul 20 12:47:24 CEST 2016 on sn-devel-144