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/test/OpenStack/test_settings.py b/test/OpenStack/test_settings.py
new file mode 100644
index 0000000..dcc1053
--- /dev/null
+++ b/test/OpenStack/test_settings.py
@@ -0,0 +1,59 @@
+# Copyright 2017 Intel Research and Development Ireland Limited
+# *************************************************************
+
+# This file is part of OSM Monitoring module
+# All Rights Reserved to Intel Corporation
+
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+
+#         http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: helena.mcgough@intel.com or adrian.hoban@intel.com
+##
+"""Tests for settings for OpenStack plugins configurations."""
+
+import logging
+
+import os
+
+import unittest
+
+import mock
+
+from plugins.OpenStack.settings import Config
+
+__author__ = "Helena McGough"
+
+log = logging.getLogger(__name__)
+
+
+class TestSettings(unittest.TestCase):
+    """Test the settings class for OpenStack plugin configuration."""
+
+    def setUp(self):
+        """Test Setup."""
+        super(TestSettings, self).setUp()
+        self.cfg = Config.instance()
+
+    def test_set_os_username(self):
+        """Test reading the environment for OpenStack plugin configuration."""
+        self.cfg.read_environ("my_service")
+
+        self.assertEqual(self.cfg.OS_USERNAME, "my_service")
+
+    @mock.patch.object(os, "environ")
+    def test_read_environ(self, environ):
+        """Test reading environment variables for configuration."""
+        self.cfg.read_environ("my_service")
+
+        # Called for each key in the configuration dictionary
+        environ.assert_called_once