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/tempest/tests/network/base.py b/tempest/tests/network/base.py
index f993441..90b351d 100644
--- a/tempest/tests/network/base.py
+++ b/tempest/tests/network/base.py
@@ -48,7 +48,7 @@
             cls.client.delete_network(network['id'])
 
     def create_network(self, network_name=None):
-        """Wrapper utility that returns a test network"""
+        """Wrapper utility that returns a test network."""
         network_name = network_name or rand_name('test-network')
 
         resp, body = self.client.create_network(network_name)