[WIP] Simplify dns management

[sdodson]

This relies on the node service configuring dnsmasq for all the zones
that the node should be responsible via dbus.

This removes all install time node specific configuration as well.

Relies on openshift/origin#16740

[michaelgugino]

I was thinking we might want to make except-interface configurable. Today it listens only on one interface (the public interface), however with bind-dynamic we will listen on every interface. Some users might have machines with multiple lans, and it might not be desireable for them to bind to those interfaces.

I would make this a template, accept a user-provided list, and join into a csv or space separated, not sure what dns mask takes here.

[openshift-ci-robot]

@sdodson: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/logging	9a3117b	link	/test logging
ci/openshift-jenkins/install	9a3117b	link	/test install
ci/openshift-jenkins/containerized	9a3117b	link	/test containerized
ci/openshift-jenkins/upgrade	9a3117b	link	/test upgrade
ci/openshift-jenkins/system-containers	9a3117b	link	/test system-containers

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