Fix response bootable parameter type in api document

This commit fixes the response bootable parameter type in the api
document. The type is string not boolean in the current code. And
the request parameter's type is boolean. I think this is an
inconsistency but we shouldn't change it to keep the backward
compatibility.

Change-Id: Ia0c70341f595580d12888e1f517e314fb98d4a6b

api-ref/source/v2/parameters.yaml

@@ -310,13 +310,13 @@ bootable:
   in: body
   required: true
   type: boolean
-bootable_1:
+bootable_response:
   description: |
     Enables or disables the bootable attribute. You
     can boot an instance from a bootable volume.
   in: body
-  required: false
-  type: boolean
+  required: true
+  type: string
 capabilities:
   description: |
     The capabilities for the back end.  The value is

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

@@ -95,7 +95,7 @@ Response Parameters
    - consistencygroup_id: consistencygroup_id
    - os-vol-mig-status-attr:name_id: os-vol-mig-status-attr:name_id
    - name: name
-   - bootable: bootable
+   - bootable: bootable_response
    - created_at: created_at
    - os-volume-replication:driver_data: os-volume-replication:driver_data
    - volumes: volumes
@@ -204,7 +204,7 @@ Response Parameters
    - volume: volume
    - consistencygroup_id: consistencygroup_id
    - name: name
-   - bootable: bootable
+   - bootable: bootable_response
    - created_at: created_at
    - volume_type: volume_type
 
@@ -310,7 +310,7 @@ Response Parameters
    - consistencygroup_id: consistencygroup_id
    - os-vol-mig-status-attr:name_id: os-vol-mig-status-attr:name_id
    - name: name
-   - bootable: bootable
+   - bootable: bootable_response
    - created_at: created_at
    - os-volume-replication:driver_data: os-volume-replication:driver_data
    - volume_type: volume_type
@@ -382,7 +382,7 @@ Response Parameters
    - volume: volume
    - consistencygroup_id: consistencygroup_id
    - name: name
-   - bootable: bootable
+   - bootable: bootable_response
    - created_at: created_at
    - volume_type: volume_type
 

api-ref/source/v3/parameters.yaml

@@ -328,13 +328,13 @@ bootable:
   in: body
   required: true
   type: boolean
-bootable_1:
+bootable_response:
   description: |
     Enables or disables the bootable attribute. You
     can boot an instance from a bootable volume.
   in: body
-  required: false
-  type: boolean
+  required: true
+  type: string
 capabilities:
   description: |
     The capabilities for the back end.  The value is

api-ref/source/v3/volumes-v3-volumes.inc

@@ -95,7 +95,7 @@ Response Parameters
    - consistencygroup_id: consistencygroup_id
    - os-vol-mig-status-attr:name_id: os-vol-mig-status-attr:name_id
    - name: name
-   - bootable: bootable
+   - bootable: bootable_response
    - created_at: created_at
    - os-volume-replication:driver_data: os-volume-replication:driver_data
    - volumes: volumes
@@ -204,7 +204,7 @@ Response Parameters
    - volume: volume
    - consistencygroup_id: consistencygroup_id
    - name: name
-   - bootable: bootable
+   - bootable: bootable_response
    - created_at: created_at
    - volume_type: volume_type
 
@@ -310,7 +310,7 @@ Response Parameters
    - consistencygroup_id: consistencygroup_id
    - os-vol-mig-status-attr:name_id: os-vol-mig-status-attr:name_id
    - name: name
-   - bootable: bootable
+   - bootable: bootable_response
    - created_at: created_at
    - os-volume-replication:driver_data: os-volume-replication:driver_data
    - volume_type: volume_type
@@ -382,7 +382,7 @@ Response Parameters
    - volume: volume
    - consistencygroup_id: consistencygroup_id
    - name: name
-   - bootable: bootable
+   - bootable: bootable_response
    - created_at: created_at
    - volume_type: volume_type