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:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-25-1817/flakey.log

The failure seems to be in the "samba-systemkrb5" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-25-1817/samba-systemkrb5.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-25-1817/samba-systemkrb5.stdout
  
The top commit at the time of the failure was:

commit b50ca162733b097cd16d346525dde2e1fef2d656
Author: Andreas Schneider <asn at samba.org>
Date:   Thu Apr 25 08:05:56 2019 +0200

    gitlab-ci: Remove Ubuntu 14.04
    
    Ubuntu 14.04 a compiler which complains about valid C99 code and also it
    doesn't offer GnuTLS >= 3.2 which we require to move to GnuTLS.
    
    Signed-off-by: Andreas Schneider <asn at samba.org>
    Reviewed-by: Ralph Boehme <slow at samba.org>
    
    Autobuild-User(master): Andreas Schneider <asn at cryptomilk.org>
    Autobuild-Date(master): Thu Apr 25 16:52:57 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

Checking for pam_vsyslog                                                          : ok 
Checking for pam_syslog                                                           : ok 
Checking for declaration of pam_vprompt                                           : no 
Checking for declaration of pam_vprompt (as enum)                                 : no 
Checking for declaration of pam_prompt                                            : no 
Checking for declaration of pam_prompt (as enum)                                  : no 
Checking for declaration of pam_strerror                                          : yes 
Checking C prototype for pam_strerror                                             : no 
Checking for system tdb (>=1.4.0)                                                 : not found 
Checking for python version >= 3.4.0                                              : 3.4.3 
python headers                                                                    : using cache 
Checking linker accepts -Wl,-no-undefined                                         : yes 
Checking linker accepts ['-undefined', 'dynamic_lookup']                          : no 
Checking for header sys/auxv.h                                                    : yes 
Checking for getauxval                                                            : ok 
Checking linker accepts -Wl,-no-undefined                                         : yes 
Checking linker accepts ['-undefined', 'dynamic_lookup']                          : no 
Checking for python version >= 3.4.0                                              : 3.4.3 
python headers                                                                    : using cache 
Checking for system talloc (>=2.2.0)                                              : not found 
Checking for system pytalloc-util.cpython-34m (>=2.2.0)                           : not found 
Checking value of NSIG                                                            : yes 
Checking value of _NSIG                                                           : yes 
Checking value of SIGRTMAX                                                        : yes 
Checking value of SIGRTMIN                                                        : yes 
Checking for python version >= 3.4.0                                              : 3.4.3 
python headers                                                                    : using cache 
Checking linker accepts -Wl,-no-undefined                                         : yes 
Checking linker accepts ['-undefined', 'dynamic_lookup']                          : no 
Checking for program 'xsltproc'                                                   : /usr/bin/xsltproc 
Checking for python version >= 3.4.0                                              : 3.4.3 
python headers                                                                    : using cache 
Checking for a 64-bit host to support lmdb                                        : yes 
Checking for lmdb >= 0.9.16                                                       : not found 
Checking for header lmdb.h                                                        : yes 
Checking for lmdb >= 0.9.16 via header check                                      : yes 
Checking for library lmdb                                                         : yes 
Checking for mdb_env_create                                                       : ok 
Checking linker accepts -Wl,-no-undefined                                         : yes 
Checking linker accepts ['-undefined', 'dynamic_lookup']                          : no 
Checking linker accepts ['-Wl,--wrap=test']                                       : yes 
Looking for kerberos features
Checking for program 'krb5-config.heimdal'                                        : /usr/bin/krb5-config.heimdal 
Checking for program 'krb5-config'                                                : /usr/bin/krb5-config 
Checking for ''                                                                   : yes 
Checking for 'kadm-server'                                                        : yes 
Checking for library kadm5srv_mit                                                 : yes 
Checking for kadm5_init                                                           : ok 
Checking for 'kdb'                                                                : yes 
Checking for 'gssapi'                                                             : yes