Fix chronyd_server_directive

[alanmcanonical]

Description:

• Fix sed in chronyd_server_directive tests/
• Add mixed pool and server entries test case for chronyd_server_directive
• Fix oval regex

Rationale:

• sed contains a syntax error
• Only entries starting with \s*server is allowed

[openshift-ci]

Hi @alanmcanonical. Thanks for your PR.

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[alanmcanonical]

test result before fix (added mixed.fail.sh):

libvirt: QEMU Driver error : argument unsupported: QEMU guest agent is not configured
INFO - xccdf_org.ssgproject.content_rule_chronyd_server_directive
INFO - Script file_empty.fail.sh using profile (all) OK
INFO - Script multiple_servers.pass.sh using profile (all) OK
INFO - Script line_missing.fail.sh using profile (all) OK
INFO - Script file_missing.fail.sh using profile (all) OK
INFO - Script only_pool.fail.sh using profile (all) OK
ERROR - Script mixed.fail.sh using profile (all) found issue:
ERROR - Rule evaluation resulted in pass, instead of expected fail during initial stage
ERROR - The initial scan failed for rule 'xccdf_org.ssgproject.content_rule_chronyd_server_directive'.
INFO - Script only_server.pass.sh using profile (all) OK

test result after fix:

python3 tests/automatus.py rule --libvirt qemu:///system sec-noble-amd64 --datastream build/ssg-ubuntu2404-ds.xml --remediate-using bash --profile chronyd_server_directive chronyd_server_directive --profile (all)
Setting console output to log level INFO

INFO - xccdf_org.ssgproject.content_rule_chronyd_server_directive
INFO - Script file_empty.fail.sh using profile (all) OK
INFO - Script multiple_servers.pass.sh using profile (all) OK
INFO - Script line_missing.fail.sh using profile (all) OK
INFO - Script file_missing.fail.sh using profile (all) OK
INFO - Script only_pool.fail.sh using profile (all) OK
INFO - Script mixed.fail.sh using profile (all) OK
WARNING - No remediation is available for rule 'xccdf_org.ssgproject.content_rule_chronyd_server_directive'.
INFO - Script only_server.pass.sh using profile (all) OK