Improve merge client logging

When submitting a job to the mergers, log more information about
the job.  Specifically the UUID will now be included for easier
cross-correlation with completion events.

Change-Id: Id92ae0c73f725da23761c59c97f0d39d64e802a9
diff --git a/zuul/merger/client.py b/zuul/merger/client.py
index 8d8f7ee..950c385 100644
--- a/zuul/merger/client.py
+++ b/zuul/merger/client.py
@@ -84,10 +84,10 @@
     def submitJob(self, name, data, build_set,
                   precedence=zuul.model.PRECEDENCE_NORMAL):
         uuid = str(uuid4().hex)
-        self.log.debug("Submitting job %s with data %s" % (name, data))
         job = gear.Job(name,
                        json.dumps(data),
                        unique=uuid)
+        self.log.debug("Submitting job %s with data %s" % (job, data))
         self.build_sets[uuid] = build_set
         self.gearman.submitJob(job, precedence=precedence,
                                timeout=300)