Add hostname to API Reference

This patch set adds hostname attribute to Audit and
ActionPlan resources in API Reference.

Change-Id: I187d44dc401d3d1770452022b8610570d459cc98

api-ref/source/parameters.yaml

@@ -170,6 +170,12 @@ actionplan_global_efficacy:
   in: body
   required: false
   type: array
+actionplan_hostname:
+  description: |
+    Hostname the actionplan is running on
+  in: body
+  required: false
+  type: string
 actionplan_state:
   description: |
     State of this action plan. To get more information about states and
@@ -191,6 +197,12 @@ audit_goal:
   in: body
   required: false
   type: string
+audit_hostname:
+  description: |
+    Hostname the audit is running on
+  in: body
+  required: false
+  type: string
 audit_interval:
   description: |
     Time interval between audit's execution.