Added support for running the tests under PyPy with tox

This is a precursor to having them run under check and gate.

This also fixes a single test which fails on PyPy, the test failes at
because it assumes a ``dict`` has a particular order for its keys when
it is printed out, on PyPy dicts have a different order sometimes, the
exact ordering is not a guarnteed property of Python.

Change-Id: Ie86726a0221e5e9aa68f7303d8ca8c7acd878f65

heatclient/tests/test_shell.py

@@ -438,9 +438,9 @@ class ShellTest(TestCase):
         show_text = self.shell('template-show teststack')
         required = [
             '{',
-            '  "AWSTemplateFormatVersion": "2010-09-09",',
-            '  "Outputs": {},',
-            '  "Resources": {},',
+            '  "AWSTemplateFormatVersion": "2010-09-09"',
+            '  "Outputs": {}',
+            '  "Resources": {}',
             '  "Parameters": {}',
             '}'
         ]

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py26,py27,pep8
+envlist = py26,py27,pypy,pep8
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}