force six install directly in the install hook

hooks/quantum_hooks.py

@@ -61,6 +61,7 @@ def install():
         src = 'cloud:precise-folsom'
     configure_installation_source(src)
     apt_update(fatal=True)
+    apt_install('python-six', fatal=True)
     if valid_plugin():
         apt_install(filter_installed_packages(get_early_packages()),
                     fatal=True)

hooks/quantum_utils.py

@@ -156,12 +156,13 @@ def get_early_packages():
     if config('plugin') in [OVS]:
         pkgs = determine_dkms_package()
     else:
-        return ['python-six']
+        return []
+#        return ['python-six']
 
     # ensure headers are installed build any required dkms packages
     if [p for p in pkgs if 'dkms' in p]:
         return pkgs + [headers_package()]
-    pkgs.append('python-six')
+#    pkgs.append('python-six')
     return pkgs