backport hammer changes that fix errors in jenkins

• https://jenkins.aws.isc.org/view/Kea-2.4/job/kea-2.4/job/ut-extended/10/execution/node/253/log/

22:45:57  [HAMMER]  2023-11-13 20:45:56,978 Job for mariadb.service failed because the control process exited with error code.
22:45:57  [HAMMER]  2023-11-13 20:45:56,978 See "systemctl status mariadb.service" and "journalctl -xe" for details.

Should be fixed by 82b3ee84.

• https://jenkins.aws.isc.org/view/Kea-2.4/job/kea-2.4/job/pkg/19/execution/node/99/log/

23:13:20  [HAMMER]  2023-11-13 21:13:20,375 >>>>> Executing mv kea-pkg/* kea-pkg in /home/alpine/workspace/kea-2.4/pkg
23:13:20  [HAMMER]  2023-11-13 21:13:20,376 mv: 'kea-pkg/isc-kea-2.4.0-r20231113204504.apk' and 'kea-pkg/isc-kea-2.4.0-r20231113204504.apk' are the same file
23:13:20  [HAMMER]  2023-11-13 21:13:20,376 mv: 'kea-pkg/isc-kea-admin-2.4.0-r20231113204504.apk' and 'kea-pkg/isc-kea-admin-2.4.0-r20231113204504.apk' are the same file
23:13:20  [HAMMER]  2023-11-13 21:13:20,376 mv: 'kea-pkg/isc-kea-common-2.4.0-r20231113204504.apk' and 'kea-pkg/isc-kea-common-2.4.0-r20231113204504.apk' are the same file

Should be fixed by 60e92acc.