Clarify python trove classifiers

+ fix unittest for python 3.8

Change-Id: If8bcae9d0ec985c9c22b12f5a8f399e227939d73

.zuul.d/zuul.yaml

@@ -5,6 +5,7 @@
         - rally-tox-pep8
         - rally-tox-py36
         - rally-tox-py37
+        - rally-tox-py38
         - rally-dsvm-tox-functional
         - rally-docker-check
         - rally-task-basic-with-existing-users:
@@ -64,6 +65,7 @@
         - rally-tox-pep8
         - rally-tox-py36
         - rally-tox-py37
+        - rally-tox-py38
         - rally-dsvm-tox-functional
         - rally-docker-check
         - rally-task-simple-job

CHANGELOG.rst

@@ -25,6 +25,8 @@ Added
 * The *rally_openstack.task.context.OpenStackContext* class which provides
   helpers for all OpenStack context.
 
+* Declare Python 3.8 support
+
 Changed
 ~~~~~~~
 

setup.cfg

@@ -15,12 +15,10 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
-    Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
 
 [files]
 packages =

tests/unit/test_ddt.py

@@ -68,13 +68,13 @@ class DDTDecoratorChecker(ast.NodeVisitor):
                            "but is not decorated with `ddt.ddt`" %
                            cls.name)
                     self.errors[cls.name] = {
-                        "lineno": node.lineno,
+                        "lineno": decorator.lineno,
                         "message": msg
                     }
 
 
 class DDTDecoratorCheckerTestCase(test.TestCase):
-    tests_path = os.path.join(os.path.dirname(__file__))
+    tests_path = os.path.dirname(__file__)
 
     def test_ddt_class_decorator(self):
         """Classes with DDT-decorated functions have ddt.ddt class decorator.