autobuild[sn-devel-104]: intermittent test failure detected

The autobuild test system (on sn-devel-104) 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-104/2016-12-15-0802/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-104/2016-12-15-0802/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-104/2016-12-15-0802/samba.stdout
  
The top commit at the time of the failure was:

commit a7598fb53b3a5238d49edbcbdfd218311ae73807
Author: Douglas Bagnall <[email protected]>
Date:   Wed Nov 9 15:17:00 2016 +1300

    rpc_server:netlogon Move from memcache to a tdb cache
    
    This allows the netlogon server to be moved into a multi-process model
    while still supporting clients that use a challenge from a different
    network connection.
    
    Pair-Programmed-With: Andrew Bartlett <[email protected]>
    Pair-Programmed-With: Stefan Metzmacher <[email protected]>
    
    Signed-off-by: Douglas Bagnall <[email protected]>
    Signed-off-by: Andrew Bartlett <[email protected]>
    Signed-off-by: Stefan Metzmacher <[email protected]>
    
    Autobuild-User(master): Stefan Metzmacher <[email protected]>
    Autobuild-Date(master): Wed Dec 14 20:12:14 CET 2016 on sn-devel-144