[release-4.16] Enable swap on the node

[praveenkumar]

Testing https://issues.redhat.com/browse/OCPBUGS-31035 one

After switching to OVN-K we observed increase in memory resource and one way to tackle it to have swap enabled on the node.

This PR is try to do following.

• Enable only NodeSwap feature gate instead complete Tech preview features. - https://docs.openshift.com/container-platform/4.15/rest_api/config_apis/featuregate-config-openshift-io-v1.html
• Add swapaccount=1 to kernel argument which is required for the swap - https://docs.openshift.com/container-platform/4.15/nodes/nodes/nodes-nodes-managing.html#nodes-nodes-swap-memory_nodes-nodes-managing
• Add swap feature to kubelet config
• Add systemd unit file to create swap and enable it
• Extend the disk size by 4GB because that much of space used for swap

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[praveenkumar]

/hold

[adrianriobo]

do you want to create rc9 from here?

[openshift-ci[bot]]

@praveenkumar: The following tests 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-microshift	b46ff5bea4526ab52790c2a084fe29fb257d24be	link	true	/test e2e-microshift
ci/prow/e2e-snc	b46ff5bea4526ab52790c2a084fe29fb257d24be	link	true	/test e2e-snc

Full PR test history. Your PR dashboard.

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[praveenkumar]

do you want to create rc9 from here?

No, I just wanted to test it with 4.16 to comment on the Jira ticket.

[praveenkumar]

This is still not working as expected.