Added fault response parameter to Show Server Details API.

The Show Server Details returns fault field in the failed
responses. This patch adds the fault field to the response
parameter table.

Change-Id: I413a098061eb58ba70b3a18d646398dfdac590aa
Closes-Bug: #1545972

api-ref/source/parameters.yaml

@@ -479,6 +479,12 @@ user_id_1:
   type: string
 
 # variables in body
+fault:
+  description: |
+    A fault object. Only displayed in the failed response.
+  in: body
+  required: false
+  type: object
 OS-DCF:diskConfig:
   description: |
     Controls how the API partitions the disk when you create, rebuild, or resize servers.

api-ref/source/servers.inc

@@ -461,6 +461,7 @@ Response
   - tenant_id: tenant_id
   - updated: updated
   - user_id: user_id
+  - fault: fault
 
 **Example Show Server Details: JSON response**