Allow user to specify image to use during rescue - V2 API changes

This commit includes the V2 changes.
Making changes in v2 API to take an extra parameter rescue_image_ref
as part of the rescue action API.
If specified, this image_ref will be used to rescue the instance.
If the image is not specified, then the base image ref is used by
default.

Partially Implements: blueprint allow-image-to-be-specified-during-rescue

DocImpact

Change-Id: I985b21264841a6a18a66d19ccd41753f78576776

doc/api_samples/all_extensions/extensions-get-resp.json

@@ -512,6 +512,14 @@
             "namespace": "http://docs.openstack.org/compute/ext/rescue/api/v1.1",
             "updated": "2011-08-18T00:00:00+00:00"
         },
+        {
+            "alias": "os-extended-rescue-with-image",
+            "description": "Rescue instance with the image specified.",
+            "links": [],
+            "name": "ExtendedRescueWithImage",
+            "namespace": "http://docs.openstack.org/compute/ext/extended_rescue_with_image/api/v2",
+            "updated": "2014-03-05T00:00:00+00:00"
+        },
         {
             "alias": "os-security-group-default-rules",
             "description": "Default rules for security group support.",

doc/api_samples/all_extensions/extensions-get-resp.xml

@@ -212,6 +212,9 @@
   <extension alias="os-rescue" updated="2011-08-18T00:00:00+00:00" namespace="http://docs.openstack.org/compute/ext/rescue/api/v1.1" name="Rescue">
     <description>Instance rescue mode.</description>
   </extension>
+  <extension alias="os-extended-rescue-with-image" updated="2014-03-05T00:00:00+00:00" namespace="http://docs.openstack.org/compute/ext/extended_rescue_with_image/api/v2" name="ExtendedRescueWithImage">
+    <description>Rescue instance with the image specified.</description>
+  </extension>
   <extension alias="os-security-group-default-rules" updated="2013-02-05T00:00:00+00:00" namespace="http://docs.openstack.org/compute/ext/securitygroupdefaultrules/api/v1.1" name="SecurityGroupDefaultRules">
     <description>Default rules for security group support.</description>
   </extension>