Adding webhook 'delete' command to remove non-namespaced objects

[heyvister1]

sriov-network-operator dynamically creates validating/mutating/clusterroles/clusterrolebinding cluster objects, for specified SriovOperatorConfig. These objects are not being cleaned once sriov operator is uninstalled (via Helm/Openshift).

The proposed PR is to use a small go binary within Helm pre-delete hook. This binary will delete default SriovOperatorConfig, assuming added SriovOperatorConfig finalizer will make sure sriov controller is deleting all generated cluster level objects (e.g. webhooks), prior to operator deployment object is removed by Helm

[github-actions]

Thanks for your PR,
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  Best regards.

[coveralls]

Pull Request Test Coverage Report for Build 11459784654

Details

• 80 of 116 (68.97%) changed or added relevant lines in 3 files are covered.
• 7 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.5%) to 45.467%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/sriov-network-operator-config-cleanup/cleanup.go	34	44	77.27%
cmd/sriov-network-operator-config-cleanup/main.go	0	10	0.0%
controllers/sriovoperatorconfig_controller.go	46	62	74.19%

Files with Coverage Reduction	New Missed Lines	%
controllers/drain_controller.go	1	68.06%
controllers/sriovoperatorconfig_controller.go	1	71.39%
controllers/generic_network_controller.go	5	74.38%

Totals
Change from base Build 11441395281:	0.5%
Covered Lines:	6765
Relevant Lines:	14879

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💛 - Coveralls

[heyvister1]

/test-all

[adrianchiris]

/test-all