FirmwareArchiveStage: List version in link.

List the firmware version generated in the link to the firmware
artifacts.

BUG=chromium:855291
TEST=run_tests

Change-Id: I63af90a4c4b1e7082bd99ee75230b2e24ab73acf
Reviewed-on: https://chromium-review.googlesource.com/1238950
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Lann Martin <lannm@chromium.org>
diff --git a/cbuildbot/stages/firmware_stages.py b/cbuildbot/stages/firmware_stages.py
index 1f5827d..80deda0 100644
--- a/cbuildbot/stages/firmware_stages.py
+++ b/cbuildbot/stages/firmware_stages.py
@@ -124,7 +124,7 @@
     dummy_http_url = gs.GsUrlToHttp(self.dummy_archive_url,
                                     public=False, directory=True)
 
-    label = '%s Firmware' % self._current_board
+    label = '%s firmware [%s]' % (self._current_board, self.firmware_version)
     logging.PrintBuildbotLink(label, dummy_http_url)
 
   def PushBoardImage(self):