Fix api-ref with Sphinx 1.5

Sphinx 1.5 is more picky about highlighting and currently building of
api-ref fails with:

Warning, treated as error:
/home/aj/Software/vcs/OpenStack/openstack/nova/api-ref/source/index.rst:4:
WARNING: Could not lex literal_block as "json". Highlighting skipped.

Fix problems found:
Remove duplicate "progress: 0" from
os-rescue/server-get-resp-unrescue.json,
os-server-tags/v2.26/servers-tags-details-resp.json,
os-server-tags/v2.26/server-tags-show-details-resp.json.

Change json to javascript for highlighting of delete_info.

Change-Id: I7cd969fb4c9d4bff995c34725cfb739cccaba12c

api-ref/source/parameters.yaml

@@ -340,7 +340,7 @@ delete_info:
     Information for snapshot deletion. Include the ID of the associated volume. For
     example:
 
-    .. code-block:: json
+    .. code-block:: javascript
 
        DELETE /os-assisted-volume-snapshots?delete_info='{"volume_id": "521752a6-acf6-4b2d-bc7a-119f9148cd8c"}'
   in: query

doc/api_samples/os-rescue/server-get-resp-unrescue.json

@@ -65,7 +65,6 @@
         "os-extended-volumes:volumes_attached": [],
         "OS-SRV-USG:launched_at": "2013-09-23T13:37:00.880302",
         "OS-SRV-USG:terminated_at": null,
-        "progress": 0,
         "security_groups": [
             {
                 "name": "default"

doc/api_samples/os-server-tags/v2.26/server-tags-show-details-resp.json

@@ -75,7 +75,6 @@
         "os-extended-volumes:volumes_attached": [],
         "OS-SRV-USG:launched_at": "2013-09-23T13:37:00.880302",
         "OS-SRV-USG:terminated_at": null,
-        "progress": 0,
         "security_groups": [
             {
                 "name": "default"

doc/api_samples/os-server-tags/v2.26/servers-tags-details-resp.json

@@ -76,7 +76,6 @@
             "os-extended-volumes:volumes_attached": [],
             "OS-SRV-USG:launched_at": "2013-09-23T13:53:12.774549",
             "OS-SRV-USG:terminated_at": null,
-            "progress": 0,
             "security_groups": [
                 {
                     "name": "default"