netavark: dhcp_proxy: use dns servers from dhcp lease

[agorgl]

Fixes #866

[agorgl]

Fixed as you proposed, thanks for the suggestions!

[agorgl]

@Luap99 this should be good to go

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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[mheon]

LGTM

[mheon]

/lgtm

[agorgl]

I think I tested it back in December (but it did not merge then because I didn't fix the linter checks failing)