allow to customize nameserver deployment

[thirdeyenick]

This allows to customize the nameserver deployment via the DNSConfig CRD. It allows to set the command, environment variables and pod labels.

[coveralls]

Pull Request Test Coverage Report for Build 12391169287

Details

• 18 of 40 (45.0%) changed or added relevant lines in 2 files are covered.
• 90 unchanged lines in 21 files lost coverage.
• Overall coverage increased (+0.02%) to 51.376%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/k8s-operator/nameserver.go	15	23	65.22%
k8s-operator/apis/v1alpha1/zz_generated.deepcopy.go	3	17	17.65%

Files with Coverage Reduction	New Missed Lines	%
k8s-operator/sessionrecording/ws/conn.go	1	84.85%
cmd/k8s-operator/nameserver.go	1	72.73%
packages/deb/deb.go	1	87.06%
types/persist/persist.go	2	88.46%
util/syspolicy/rsop/resultant_policy.go	2	94.78%
tstest/natlab/vnet/vnet.go	2	44.06%
ipn/ipnlocal/local.go	2	64.21%
k8s-operator/sessionrecording/fakes/fakes.go	2	75.61%
control/controlclient/direct.go	2	62.48%
control/controlbase/conn.go	2	84.75%

Totals
Change from base Build 12375988852:	0.02%
Covered Lines:	55978
Relevant Lines:	108957

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💛 - Coveralls