do not use condition predicate while getting zone for node

[agadelshin]

This is small part of fix for #50 (fixes this log messages #50 (comment))

GetNodeConditionPredicate filtered nodes with conditions different from "Ready", and we're getting this messages when node is deleting from instance group.

[k8s-ci-robot]

Hi @pondohva. Thanks for your PR.

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[agadelshin]

/assign @thockin

[thockin]

/ok-to-test

[freehan]

It would be great if you could add a unit test for that function.

[freehan]

/lgtm

I will add a unit test later.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: freehan, pondohva

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[agadelshin]

@freehan thank you. Sorry, I was on vacation.