main/krb5: test failures after openldap 2.6

Test fails on builders after !24084 (merged)

disabled via 1ac4b4fd ff01e75b

PYTHONPATH=../util VALGRIND="" python3 ./t_general.py 
*** Failure: /home/buildozer/aports/main/krb5/src/krb5-1.19.2/src/clients/kinit/kinit failed with code 1.
*** Last command (#5): /home/buildozer/aports/main/krb5/src/krb5-1.19.2/src/clients/kinit/kinit user@KRBTEST.COM
*** Output of last command:
Password for user@KRBTEST.COM: 
kinit: Password incorrect while getting initial credentials
*** Failed in test pass: default
For details, see: /home/buildozer/aports/main/krb5/src/krb5-1.19.2/src/tests/testlog
Or re-run this test script with the -v flag:
    cd /home/buildozer/aports/main/krb5/src/krb5-1.19.2/src/tests
    PYTHONPATH=/home/buildozer/aports/main/krb5/src/krb5-1.19.2/src/util /usr/bin/python3 ./t_general.py -v

Use --debug=NUM to run a command under a debugger.  Use
--stop-after=NUM to stop after a daemon is started in order to
attach to it with a debugger.  Use --help to see other
options.
make[1]: *** [Makefile:766: check-pytests] Error 1
make[1]: *** Waiting for unfinished jobs....