api-ref, fwaas-v2: Remove 'status' from request.

Current API says 'status' is a valid parameter when creating (POST)
or updating (PUT) a firewall group. This is not the case.
For example, when trying to create a firewall group
with a 'status' results in a 400 response with the message:
"Attribute 'status' not allowed in POST"

Change-Id: I2e6d2f291c42d54bceb37f09671f0e269cb68d9d

api-ref/source/v2/fwaas-v2.inc

@@ -165,7 +165,6 @@ Request
    - ports: firewall_group_ports-body-optional
    - project_id: project_id-body-optional
    - shared: firewall_group_shared-body-optional
-   - status: firewall_group_status-body-optional
    - tenant_id: project_id-body-optional
 
 Request Example
@@ -225,7 +224,6 @@ Request
    - name: firewall_group_name-body-optional
    - ports: firewall_group_ports-body-optional
    - shared: firewall_group_shared-body-optional
-   - status: firewall_group_status-body-optional
 
 Request Example
 ---------------

api-ref/source/v2/parameters.yaml

@@ -2546,14 +2546,6 @@ firewall_group_shared-body-required:
   in: body
   required: true
   type: boolean
-firewall_group_status-body-optional:
-  description: |
-    The status of the firewall group. Valid values are ``ACTIVE``,
-    ``INACTIVE``, ``ERROR``, ``PENDING_UPDATE``, or
-    ``PENDING_DELETE``.
-  in: body
-  required: false
-  type: string
 firewall_group_status-body-required:
   description: |
     The status of the firewall group. Valid values are ``ACTIVE``,