Add tests for rule accounts_password_pam_minlen

[matusmarhefka]

New test scenarios for the rule accounts_password_pam_minlen.

[openshift-ci]

@matusmarhefka: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-ocp4-moderate	9353e73	link	/test e2e-aws-ocp4-moderate
ci/prow/e2e-aws-ocp4-cis-node	9353e73	link	/test e2e-aws-ocp4-cis-node

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[jan-cerny]

[jcerny@localhost scap-security-guide{pr/6751}]$ tests/test_rule_in_container.sh accounts_password_pam_minlen
Setting console output to log level INFO
INFO - The base image option has been specified, choosing Podman-based test environment.
INFO - Logging into /home/jcerny/work/git/scap-security-guide/logs/rule-custom-2021-04-01-1404/test_suite.log
INFO - xccdf_org.ssgproject.content_rule_accounts_password_pam_minlen
INFO - Script commented.fail.sh using profile (all) OK
INFO - Script correct.pass.sh using profile (all) OK
INFO - Script missing.fail.sh using profile (all) OK
INFO - Script short.fail.sh using profile (all) OK
[jcerny@localhost scap-security-guide{pr/6751}]$