fix systemd version recognizing in cgroup hook

[vchlum]

Describe Bug or Feature

The systemd version in cgroup hook is not recognized on miscellaneous systems:

(BULLSEYE)root@torque4:~# grep "systemd version seems to be" /var/spool/pbs/mom_logs/20240312 
03/12/2024 09:54:39;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 09:56:40;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0

and the cgroups service pbs_jobs.service is not started on mom.

The command called to get the systemd version is systemctl --system show --property=Version.

See the result on miscellaneous systems:

(BULLSEYE)root@torque4:~# systemctl --system show --property=Version
Version=247.3-7+deb11u4

[root@almalinux ~]# systemctl --system show --property=Version
Version=252-18.el9

but the parsing regex r'Version=\D*(\d+)' lacks the string after major version number. The systemd version is not recognized in such cases.

Describe Your Change

Change the parsing regex to ignore any string after major version number.

Link to Design Doc

Attach Test and Valgrind Logs/Output

Manual test:
After the fix and importing a new version of the hook, the version is recognized, and the service started:

(BULLSEYE)root@torque4:~# grep "systemd version seems to be" /var/spool/pbs/mom_logs/20240312 
03/12/2024 09:54:39;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 09:56:40;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 09:57:29;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 09:57:30;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 09:59:30;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 10:01:32;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 10:03:33;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 10:05:34;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 10:07:35;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 10:09:37;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 10:11:38;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 0
03/12/2024 10:13:39;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 247
03/12/2024 10:14:43;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 247
03/12/2024 10:14:43;0800;pbs_python;Hook;pbs_python;__init__: systemd version seems to be 247

(BULLSEYE)root@torque4:~# systemctl status  pbs_jobs.service 
● pbs_jobs.service - PBS Pro job parent service
     Loaded: loaded (/run/systemd/system/pbs_jobs.service; static)
     Active: active (running) since Tue 2024-03-12 10:14:43 CET; 17s ago
   Main PID: 2112267 (sleep)
      Tasks: 1
     CGroup: /pbs_jobs.service
             └─2112267 /bin/sleep infinity

Mar 12 10:14:43 torque4.grid.cesnet.cz systemd[1]: Started PBS Pro job parent service.

[bayucan]

Looks fine.

[SudeshnaMoulik]

Thanks for this MR @vchlum