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The main fix here is to use the ipconfig_static_path instead of
ipconfig->device_path when setting the parameters.

Also added some logging and cleaned up error messages.

Note that this only fixes static IP setting when flimflam is
enabled: this code doesn't properly talk to shill for that
operation because it still tries to create IPConfigs, which
shill doesn't implement.

BUG=chromium-os:29050
TEST=Ran on device, configured ethernet for static IP, and verified
     that it showed up in the flimflam profile.

Review URL: https://chromiumcodereview.appspot.com/10412026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138233 0039d316-1c4b-4281-b951-d872f2087c98