updateKernelArgs: pass kargs instead of MCs

[mkenigs]

This is a refactor to allow reusing updateKernelArgs() for layering. It
is a minor improvement for master since it better protects
MachineConfigs from unintended modification by updateKernelArgs(), and
it simplifies test code which doesn't have to create dummy
MachineConfigs

[cgwalters]

Yep, no argument here!
/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cgwalters, mkenigs

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[mkenigs]

/cherry-pick master

[openshift-cherrypick-robot]

@mkenigs: once the present PR merges, I will cherry-pick it on top of master in a new PR and assign it to you.

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[openshift-ci]

@mkenigs: 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-gcp-op-single-node	c113a34	link	false	/test e2e-gcp-op-single-node
ci/prow/e2e-aws-upgrade	c113a34	link	false	/test e2e-aws-upgrade
ci/prow/e2e-gcp-single-node	c113a34	link	false	/test e2e-gcp-single-node

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[openshift-cherrypick-robot]

@mkenigs: new pull request created: #3055

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/cherry-pick master

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