shill: Rename address -> mac_address

Rename the "address" field in DeviceInfo::Info to "mac_address",
since this struct will now also hold IP addresses.

BUG=chromium-os:19744
TEST=Rerun unit tests

Change-Id: I724e389c32ca6a730d476d825f916461161e1442
Reviewed-on: http://gerrit.chromium.org/gerrit/7179
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
diff --git a/modem.cc b/modem.cc
index 4f38518..50aa67c 100644
--- a/modem.cc
+++ b/modem.cc
@@ -85,7 +85,8 @@
   }
 
   ByteString address_bytes;
-  if (!manager_->device_info()->GetAddress(interface_index, &address_bytes)) {
+  if (!manager_->device_info()->GetMACAddress(interface_index,
+                                              &address_bytes)) {
     // TODO(petkov): ensure that DeviceInfo has heard about this device before
     //               we go ahead and try to add it.
     LOG(ERROR) << "Unable to create cellular device without a hardware addr.";