network_3GIdentifiers: Improve logging.

When a property fails to match, log the label on which match failed along with
the different values obtained.

BUG=none
TEST=Run network_3GIdentifiers.
Change-Id: If43e81036c170c34bb0a32be6c8c4bc9c2e544c5
Reviewed-on: https://chromium-review.googlesource.com/178707
Reviewed-by: Ben Chan <benchan@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
1 file changed