Add job tags

This allows us to add arbitrary string 'tags' to jobs.  These may
then be inspected inside of parameter functions for any purpose.
In OpenStack, we will likely pass these through untouched to the
the build so that they can be picked up by the logstash worker
and we can record extra metadata about jobs.

Change-Id: Ibc00c6d30cdfe4678864adb13421a4d9f71f5128
diff --git a/tests/base.py b/tests/base.py
index f3bfa4e..405caa0 100755
--- a/tests/base.py
+++ b/tests/base.py
@@ -620,6 +620,7 @@
             BuildHistory(name=self.name, number=self.number,
                          result=result, changes=changes, node=self.node,
                          uuid=self.unique, description=self.description,
+                         parameters=self.parameters,
                          pipeline=self.parameters['ZUUL_PIPELINE'])
         )