shill: Set Ethernet friendly name to "Ethernet"

Cosmetic.

BUG=chromium-os:29707
TEST=Run and look at network drop-up.

Change-Id: Id1941616ba30240af794ea9908e709690c0d3334
Reviewed-on: https://gerrit.chromium.org/gerrit/20604
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Commit-Ready: Paul Stewart <pstew@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
diff --git a/ethernet_service.cc b/ethernet_service.cc
index dda7e1b..e5c11c0 100644
--- a/ethernet_service.cc
+++ b/ethernet_service.cc
@@ -40,7 +40,7 @@
       ethernet_(device) {
   set_connectable(true);
   set_auto_connect(true);
-  set_friendly_name(GetStorageIdentifier());
+  set_friendly_name("Ethernet");
   SetStrength(kStrengthMax);
 }