Fix T401 and T402 errors

Fix all the one line docstring errors in T401 and T402, now
we no longer ignore any of our own rules in hacking.py

Fix run_tests.sh to pick up the 'stress' directory, which tox
does for pep8. Additional fixes to the stress tests for T4* tests

Change-Id: Ie569a924e8eb355afbbd9b244f77dec34061b5cb
diff --git a/stress/config.py b/stress/config.py
index 64091cd..ca86ce5 100755
--- a/stress/config.py
+++ b/stress/config.py
@@ -39,15 +39,15 @@
 
     @property
     def nova_logdir(self):
-        """Directory containing log files on the compute nodes"""
+        """Directory containing log files on the compute nodes."""
         return self.get("nova_logdir", None)
 
     @property
     def controller(self):
-        """Controller host"""
+        """Controller host."""
         return self.get("controller", None)
 
     @property
     def max_instances(self):
-        """Maximum number of instances to create during test"""
+        """Maximum number of instances to create during test."""
         return self.get("max_instances", 16)