Revert of Change to Shill's IPConfig objects.

Revert of Change to Shill's IPConfig objects. (patchset #1 id:1 of https://codereview.chromium.org/762243002/)

Reason for revert:
Breaks the build: http://build.chromium.org/p/chromium.webkit/builders/Linux%20ChromiumOS%20Tests%20%281%29/builds/7051

Original issue's description:
> Change to Shill's IPConfig objects.
>
> Before a recent Shill change, Static and Saved IP config properties were stored in toplevel properties with prefixed keys like kStaticIPAddressProperty.
> This change makes use of Shill now exposing these properties nested under a StaticIPConfig and SavedIPConfig dictionary.
>
> This also makes the translation between a list of nameservers and a comma-separated string obsolete.
>
> BUG=411289
>
> Committed: https://crrev.com/ac2d359b101e4c97455125958db4a999bf26135f
> Cr-Commit-Position: refs/heads/master@{#306400}

TBR=stevenjb@chromium.org,pneubeck@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=411289
Committed: https://crrev.com/aed3df70b1a9b209d415220f49ac2fad5ccfb15d
Cr-Commit-Position: refs/heads/master@{#306412}

[pfeldman, 2014-12-02 17:43:07]

Created Revert of Change to Shill's IPConfig objects.

[commit-bot: I haz the power, 2014-12-02 17:44:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/776603002/1

[commit-bot: I haz the power, 2014-12-02 17:44:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-02 17:45:41]

Patchset 1 (id:??) landed as
https://crrev.com/aed3df70b1a9b209d415220f49ac2fad5ccfb15d
Cr-Commit-Position: refs/heads/master@{#306412}