[WIP] Add support for Drop-in config dir in OCP

[sohankunkerkar]

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- Description for the changelog

[openshift-ci]

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[openshift-ci]

@sohankunkerkar: 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/verify	8cc06a9	link	true	/test verify
ci/prow/e2e-gcp-op	8cc06a9	link	true	/test e2e-gcp-op
ci/prow/e2e-gcp-op-ocl	8cc06a9	link	false	/test e2e-gcp-op-ocl
ci/prow/e2e-vsphere-ovn-zones	8cc06a9	link	false	/test e2e-vsphere-ovn-zones
ci/prow/e2e-hypershift	8cc06a9	link	true	/test e2e-hypershift
ci/prow/e2e-aws-ovn-upgrade	8cc06a9	link	true	/test e2e-aws-ovn-upgrade
ci/prow/e2e-agent-compact-ipv4	8cc06a9	link	false	/test e2e-agent-compact-ipv4
ci/prow/unit	8cc06a9	link	true	/test unit
ci/prow/e2e-aws-ovn-upgrade-out-of-change	8cc06a9	link	false	/test e2e-aws-ovn-upgrade-out-of-change
ci/prow/e2e-aws-ovn	8cc06a9	link	true	/test e2e-aws-ovn
ci/prow/e2e-vsphere-ovn-upi	8cc06a9	link	false	/test e2e-vsphere-ovn-upi
ci/prow/e2e-gcp-op-techpreview	8cc06a9	link	false	/test e2e-gcp-op-techpreview
ci/prow/bootstrap-unit	8cc06a9	link	false	/test bootstrap-unit
ci/prow/images	8cc06a9	link	true	/test images
ci/prow/okd-scos-e2e-aws-ovn	8cc06a9	link	false	/test okd-scos-e2e-aws-ovn
ci/prow/e2e-vsphere-ovn-upi-zones	8cc06a9	link	false	/test e2e-vsphere-ovn-upi-zones
ci/prow/e2e-azure-ovn-upgrade-out-of-change	8cc06a9	link	false	/test e2e-azure-ovn-upgrade-out-of-change
ci/prow/e2e-gcp-op-single-node	8cc06a9	link	true	/test e2e-gcp-op-single-node
ci/prow/e2e-openstack	8cc06a9	link	false	/test e2e-openstack

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[openshift-merge-robot]

PR needs rebase.

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