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-104/2016-12-12-2003/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-104/2016-12-12-2003/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-104/2016-12-12-2003/samba.stdout
  
The top commit at the time of the failure was:

commit 5f5ba893de53f624f04bbfd219aa8bf5ba595060
Author: Garming Sam <[email protected]>
Date:   Wed Dec 7 16:42:38 2016 +1300

    tests/dns: Check you cannot add empty CNAME
    
    This exercises the dns_check_name case in the DNS server. Directly
    attempting to add an invalid name with leading . or double .. cannot be
    done due to ndr_pull_component forcing the check on the client side
    (leading to a CNAME name of NUL and unexpected data of the actual name).
    
    Signed-off-by: Garming Sam <[email protected]>
    Pair-programmed-with: Bob Campbell <[email protected]>
    Reviewed-by: Andrew Bartlett <[email protected]>
    
    Autobuild-User(master): Garming Sam <[email protected]>
    Autobuild-Date(master): Mon Dec 12 08:46:26 CET 2016 on sn-devel-144