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This moves the network_property_list element and network
elements that depend on it (apnlist, ip_config, nameservers)
to a shared location so that they can be used by Web UI dialogs.

Bug: 748204
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I9d4b57167c31a8ed1811aa680838e3ba38105df2
Reviewed-on: https://chromium-review.googlesource.com/596410
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491768}