Remove force_tcp flag for nodelocalcache dot zone

[astrikos]

This PR is proposing a change in the nodelocalcache confimap.
The change is removing the force_tcp flag from the . zone that handles all external DNS requests.
Using the current nodelocalcache configuration we have experienced increased latencies for our DNS requests that needs to go to our upstream DNS server (which in our case is AWS VPC's DNS servers).
Forcing all DNS communication go through TCP can lead to increased latency and slower DNS responses since a lot of upstream DNS servers are not optimized for TCP traffic.
An example is AWS's VPC DNS server that sending all the DNS traffic through TCP cause it to increase the latencies for this requests.
The kubernetes version has already changed this configmap to skip force_tcp flag for the . zone, so it might make sense to follow their example.

Reference https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/dns/nodelocaldns/nodelocaldns.yaml#L100

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Hi @astrikos. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[olemarkus]

/ok-to-test

Are you able to sign the CLA?

[astrikos]

Are you able to sign the CLA?

I signed it

/check-cla

[astrikos]

/assign @rifelpet

[olemarkus]

/lgtm

Thanks for this!

[hakman]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: astrikos, hakman

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