Make sriov-network-config-daemon crash when configmap cannot be obtained

[jkossak]

This PR adds a line to crash sriov-network-config-daemon if it can't access the configmap with NIC interfaces.
Fixes #390

[github-actions]

Thanks for your PR,
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  Best regards.

[zeeke]

Makes sense to me. I'm not aware of any scenario in which the config-daemon can work without InitNicIDs successfully initialized.

@SchSeba I think this should not clash with #365 , as the service implementation would use another function to obtain the map. Right?

[coveralls]

Pull Request Test Coverage Report for Build 3695580961

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 10 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.05%) to 25.223%

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Files with Coverage Reduction	New Missed Lines	%
controllers/sriovibnetwork_controller.go	2	65.35%
controllers/sriovnetwork_controller.go	2	69.0%
api/v1/helper.go	6	40.6%

Totals
Change from base Build 3631034070:	-0.05%
Covered Lines:	1894
Relevant Lines:	7509

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💛 - Coveralls

[SchSeba]

/lgtm