Add support for --dns flag in Docker config

[jwolski2]

This commit adds support for the --dns flag which is provided as a
Docker daemon startup flag. The flag is used to set the IP address of
the DNS server that the daemon injects into containers. Multiple --dns
flags are supported.

Closes #12755

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Jeff Wolski (a9ecfa4)

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[hakman]

Hey @jwolski2. The PR looks good, but I see EasyCLA is no reporting green. I think @olemarkus had a similar issue?
Maybe this helps too: kubernetes/org#3068.
/ok-to-test
/check-cla

[jwolski2]

Hey @hakman Thanks for the initial look. I'll double-check with my CLA Manager that all was authorized.

[sftim]

EasyCLA is in preview; @jwolski2 you do have a CLA signoff.

[jwolski2]

@hakman @sftim Okie dokie. It looks like I'm all authorized now, through EasyCLA etc!

[jwolski2]

@hakman What is the process by which we'd get this fix backported to Kops 1.19? Is that documented somewhere?

[hakman]

@jwolski2 There is no process to back-port to kOps 1.19. There is no plan to release any other builds there.
I can cherry-pick this to 1.22 and 1.21 but it may take a while for those patch versions to be released.

[jwolski2]

Just a poke to clarify whether this PR is waiting on me... @hakman @olemarkus Do you have it from here?

[hakman]

Thanks @jwolski2! :)

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