Refact probe timeouts

[rhrazdil]

Is this a BUG FIX or a FEATURE ?:

Uncomment only one, leave it on its own line:

/kind bug /kind enhancement

What this PR does / why we need it: This PR chages the timeout logic, moving the retry responsibility out of the probe functions. This simplifies the probe func interface, as we don't need to pass a timeout parameter, and it's handled by the caller.

Additionally, some comments seemed unclear. Second commit of this PR attempts to improve those.

Special notes for your reviewer:

Release note:

NONE

[qinqon]

/test pull-kubernetes-nmstate-e2e-handler-k8s-future

[kubevirt-bot]

@rhrazdil: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-nmstate-e2e-handler-k8s-future	21abe6023529d8c1075d8126c69326144e15ba8d	link	false	/test pull-kubernetes-nmstate-e2e-handler-k8s-future

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[qinqon]

/lgtm /approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qinqon

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