Implement a new datasource to support OPNFV Doctor monitor

Implements: blueprint doctor-datasource

Change-Id: I57fb0ffa22c7026be7fb6b5f732794b8a3ec163b

specs/ocata/doctor-datasource.rst

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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+==================
+Doctor Data Source
+==================
+
+https://blueprints.launchpad.net/vitrage/+spec/doctor-datasource
+
+This blueprint describes the datasource that will receive notifications from
+OPNFV Doctor monitor
+
+Problem description
+===================
+In order for Vitrage to be accepted as a reference implementation for the
+OPNFV Doctor Inspector component, it should be able to receive alarm
+notifications from the Doctor monitor.
+
+Proposed change
+===============
+The Doctor datasource will receive notifications in the format defined by
+Doctor SB API (see the reference below):
+
+::
+
+    {
+        'event': {
+            'time': '2016-04-12T08:00:00',
+            'type': 'compute.host.down',
+            'details': {
+                'hostname': 'compute-1',
+                'source': 'sample_monitor',
+                'cause': 'link-down',
+                'severity': 'critical',
+                'status': 'down',
+                'monitor_id': 'monitor-1',
+                'monitor_event_id': '123',
+            }
+        }
+    }
+
+
+Upon receiving such a notification, the Doctor datasource will create or
+delete a corresponding alarm in Vitrage, based on the 'status' field.
+
+In addition, a new evaluator template will be added in order to:
+ - Create deduced alarms on the VMs running on the host
+ - Modify the states of the host and the VMs to ERROR
+ - Call Nova force-down API to mark that the host is down
+
+
+REST API impact
+---------------
+
+The Doctor monitor sends its alarms in REST format. Another blueprint discusses
+the SB API that should be added to Vitrage in order to support it.
+See https://blueprints.launchpad.net/vitrage/+spec/support-inspector-sb-api
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  ifat-afek
+
+Work Items
+----------
+
+- Implement the Doctor datasource
+- Write a template for creating deduced alarms on the VMs and calling Nova
+  mark host down
+
+Testing
+=======
+
+The changes will be tested by unit tests, and later on also by Doctor test
+scripts.
+
+References
+==========
+
+- https://wiki.opnfv.org/display/doctor/Doctor+Home
+- http://artifacts.opnfv.org/doctor/docs/requirements/05-implementation.html
+  section 4.5.6
+