Added a Common KafkaConsumer for all of the plugins

 - Added the common consumer for all request messages
 - Updated the OpenStack plugins to use the common consumer
 - Included the access_credentials topic into this consumer
 - Added the json schemas for the openstack, vrops and cloudwatch
   access credentials
 - Updated the Openstack plugins to use access_credentials messages
 - Added and updated all necessary tests
 - Updated installation documentation

Change-Id: I1486cf7230e351e5dbf18464110e5780d392eeeb
Signed-off-by: Helena McGough <helena.mcgough@intel.com>
diff --git a/tox.ini b/tox.ini
index 17e4fab..37c4113 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,13 +40,7 @@
    VIRTUAL_ENV={envdir}
 
 [testenv:pep8]
-commands = flake8 test
-
-[testenv:venv]
-commands = {posargs}
-
-[testenv:cover]
-commands = python setup.py test --coverage
+commands = flake8 plugins
 
 [pep8]
 max-line-length = 80