Style fix for one line docstring according to flake8

Change-Id: I639819a5b1d8a476cdd8b340b8c339754f471048

Author: kromanenko

functional/tests/compute/v2/test_server.py

@@ -20,7 +20,7 @@
 
 
 class ServerTests(test.TestCase):
-    """Functional tests for server. """
+    """Functional tests for server."""
 
     NAME = uuid.uuid4().hex
     OTHER_NAME = uuid.uuid4().hex