update notifier to V3

Update nova-notifier,mistral-notifier to Syntax 3 to replace Syntax 2
Change-Id: I74e51ca8ea8913a22cea3b0d6bec2afc80002c98

doc/source/contributor/mistral-config.rst

@@ -15,7 +15,7 @@ To enable Mistral workflow execution, add mistral to the list of notifiers in
    .. code::
 
     [DEFAULT]
-    notifiers = nova,mistral
+    notifiers = mistral
 
 
 Add execute_mistral action
@@ -26,11 +26,10 @@ To execute a Mistral workflow under a certain condition, add an
 
    .. code:: yaml
 
-    - scenario:
-        condition: host_down_alarm_on_host
+    scenarios:
+      - condition: host_down_alarm [on] host
         actions:
-            action:
-                action_type: execute_mistral
-                properties:
-                    workflow: evacuate_host      # mandatory. The name of the workflow to be executed
-                    hostname: host1              # optional. A list of properties to be passed to the workflow
+          - execute_mistral:
+             workflow: evacuate_host      # mandatory. The name of the workflow to be executed
+             input:
+               host_name: host1      # optional. A list of properties to be passed to the workflow

doc/source/contributor/nova-notifier.rst

@@ -23,23 +23,19 @@ In order to support this use case, the user should perform the following:
 
 .. code:: yaml
 
-   [DEFAULT]
-   notifiers = nova
+    [DEFAULT]
+    notifiers = nova
 
 2. Determine, in the Vitrage templates, what condition(s) indicates that the
    host is down. For example:
 
 .. code:: yaml
 
-   scenarios:
-     - scenario:
-       condition: host_down_alarm_on_host
-         actions:
-           action:
-             action_type : mark_down
-               action_target:
-                 target: host
-
+    scenarios:
+      - condition: host_down_alarm [on] host
+        actions:
+          - mark_down:
+              target: host
 
 For more information about the mark-down action, see the Vitrage templates
 documentation: templates_