Sle16 libreswan approved tunnels

[teacup-on-rockingchair]

Description:

• Enable libreswan_approved_tunnels rule for sle16

Rationale:

• Adapt libreswan_approved_tunnels for sle16 and sle15
• Use checks and remediation instructions references with strongswan, as it is the default IPSec solution for sle15 and sle16 platforms
• set strongswan package is the libreswan alternative for sle15 and sle16
• Allocate CCE for sle16 support for libreswan_approved_tunnels rule

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[github-actions]

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[openshift-ci]

@teacup-on-rockingchair: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-openshift-node-compliance	9a2a79a	link	true	/test e2e-aws-openshift-node-compliance

Full PR test history. Your PR dashboard.

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