Remove limits from the coredns deployment default values.yaml

[FabioAntunes]

Due to a bug in Helm there's no way for us to unset limits when using CoreDNS as sub chart.
helm/helm#12637

May I suggest we do this on the current values.yaml?

resources:
-  limits:
-    cpu: 100m
-    memory: 128Mi
  requests:
    cpu: 100m
    memory: 128Mi

With the current chart there's no way for us deploy CoreDNS without CPU limits

Happy to open a PR

[hagaibarel]

Hi,

While I generally agree that this is right, it is a breaking change that moves coredns from Guaranteed QoS to Best Effort which might have negative affects on deployments