Update tests for file_groupownership_sshd_private_key

[Mab879]

Description:

Make the tests in file_groupownership_sshd_private_key select the correct group for owning ssh keys based on the OS.

Rationale:

Fixes #12893

[codeclimate]

Code Climate has analyzed commit abc3519 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 61.9% (0.0% change).

View more on Code Climate.

[jan-cerny]

I have executed the test scenario and I have seen that the correct_groupowner.pass.sh started to pass.

jcerny@fedora:~/work/git/scap-security-guide (pr/12896)$ python3 tests/automatus.py rule --libvirt qemu:///system ssgts_rhel10 file_groupownership_sshd_private_key
Setting console output to log level INFO
INFO - The base image option has not been specified, choosing libvirt-based test environment.
INFO - Logging into /home/jcerny/work/git/scap-security-guide/logs/rule-custom-2025-01-27-0949-1/test_suite.log
INFO - xccdf_org.ssgproject.content_rule_file_groupownership_sshd_private_key
INFO - Script incorrect_groupowner.fail.sh using profile (all) OK
INFO - Script correct_groupowner.pass.sh using profile (all) OK
INFO - Script multiple_keys.fail.sh using profile (all) OK
jcerny@fedora:~/work/git/scap-security-guide (pr/12896)$ python3 tests/automatus.py rule --libvirt qemu:///system ssgts_rhel10 --remediate-using ansible file_groupownership_sshd_private_key
Setting console output to log level INFO
INFO - The base image option has not been specified, choosing libvirt-based test environment.
INFO - Logging into /home/jcerny/work/git/scap-security-guide/logs/rule-custom-2025-01-27-0951/test_suite.log
INFO - xccdf_org.ssgproject.content_rule_file_groupownership_sshd_private_key
INFO - Script incorrect_groupowner.fail.sh using profile (all) OK
INFO - Script correct_groupowner.pass.sh using profile (all) OK
INFO - Script multiple_keys.fail.sh using profile (all) OK

Also I have checked the prescripts log to see what group is used in chgrp and I have seen this:

  9 ##### file_groupownership_sshd_private_key / correct_groupowner.pass.sh #####
 10 ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null root@192.168.124.175 cd /root/ssgts/file_groupownership_sshd_private_key; SHARED=/root/        ssgts/shared bash -x correct_groupowner.pass.sh
 11 STDERR: Warning: Permanently added '192.168.124.175' (ED25519) to the list of known hosts.
 12 + grep -q root /etc/group
 13 ++ mktemp -p /etc/ssh/ XXXX_key
 14 + FAKE_KEY=/etc/ssh/UE5Y_key
 15 + chgrp root /etc/ssh/UE5Y_key