Keep the job label around for the test.

No idea if this is net good.  Mostly tests should be insensitive to
what they're called.  Storing logs, reporting results, seem to be
acceptable uses, but they are hard to codify strictly.

BUG=None
TEST=None

Change-Id: I6aee8b61caa286c8a944ccb19e524a931754df5c
Reviewed-on: https://gerrit.chromium.org/gerrit/25226
Commit-Ready: Peter Mayo <[email protected]>
Tested-by: Peter Mayo <[email protected]>
Reviewed-by: Peter Mayo <[email protected]>
diff --git a/server/server_job.py b/server/server_job.py
index 7c33a11..9cf5d84 100644
--- a/server/server_job.py
+++ b/server/server_job.py
@@ -178,6 +178,7 @@
             self.user = getpass.getuser()
 
         self.args = args
+        self.label = label
         self.machines = machines
         self._client = client
         self.warning_loggers = set()