Generalize configuration for controller access.

Add comment about libvirt resize.

Fix stress bug.

Change-Id: Ieb751abd24fb7a5bc4747550c465541ab2fbfc9e
diff --git a/stress/config.py b/stress/config.py
index 3f107af..0dce816 100755
--- a/stress/config.py
+++ b/stress/config.py
@@ -41,3 +41,8 @@
     def nova_logdir(self):

         """Directory containing log files on the compute nodes"""

         return self.get("nova_logdir", None)

+

+    @property

+    def controller(self):

+        """Controller host"""

+        return self.get("controller", None)