add --dns-loop-detect option to dnsmasq run by kube-dns

[dixudx]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #67299

Special notes for your reviewer:
/cc @kubernetes/sig-network-pr-reviews

Release note:

add --dns-loop-detect option to dnsmasq run by kube-dns

[dixudx]

/retest

[neolit123]

--dns-loop-detect
Enable code to detect DNS forwarding loops; ie the situation where a query sent to one of the upstream server eventually returns as a new query to the dnsmasq instance. The process works by generating TXT queries of the form .test and sending them to each upstream server. The hex is a UID which encodes the instance of dnsmasq sending the query and the upstream server to which it was sent. If the query returns to the server which sent it, then the upstream server through which it was sent is disabled and this event is logged. Each time the set of upstream servers changes, the test is re-run on all of them, including ones which were previously disabled.

there might be a slight performance impact.
but given:

• this is a bug fix
• we are deprecating kube-dns

LGTM

[dixudx]

/assign @m1093782566 @feiskyer

[dixudx]

/kind bug

Kube-dns will still co-exist for several releases according to deprecation policy. We need to fix it.

[feiskyer]

LGTM. @MrHohn could you also take a look?

/assign @MrHohn

[MrHohn]

Did some manual testing this seems to work.

LGTMing per the explanation on #67299 (comment).
/lgtm

[MrHohn]

@bowei @tuminoid this might fix kubernetes/dns#169 as well.

[dixudx]

ping @timothysc @fabianofranz for approval. Thanks.

[dixudx]

/retest

[timothysc]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dixudx, MrHohn, timothysc

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Needs approval from an approver in each of these files:

• cluster/addons/dns/OWNERS [MrHohn]
• cmd/kubeadm/OWNERS [timothysc]
• test/kubemark/OWNERS [MrHohn,timothysc]

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[k8s-github-robot]

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[k8s-github-robot]

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