Fix pep8 and pyflakes versions and fix tox.ini

Change-Id: Id70af7f8684746cecaaadae067b4346e8e1b4dc9

tools/test-requires

@@ -1,7 +1,10 @@
-# This file is managed by openstack-depends
-coverage>=3.6
+# Fix versions for pep8/pyflakes/flake8/hacking
+pep8==1.4.5
+pyflakes==0.7.2
 flake8==2.0
-hacking>=0.5.3,<0.6
+hacking>=0.5.6,<0.6
+
+coverage>=3.6
 mock>=0.8.0
 nose
 openstack.nose_plugin>=0.7

tox.ini

@@ -2,6 +2,7 @@
 envlist = py26,py27,pep8
 
 [testenv]
+sitepackages = True
 setenv =
     VIRTUAL_ENV={envdir}
     NOSE_WITH_OPENSTACK=1
@@ -20,12 +21,11 @@ commands = nosetests {posargs}
 setenv = NOSE_WITH_COVERAGE=1
 
 [tox:jenkins]
+sitepackages = False
 downloadcache = ~/cache/pip
 
 [testenv:pep8]
-deps =
-    flake8
-    hacking
+sitepackages = False
 commands = flake8
 
 [testenv:venv]