Return HTTP 400 on list for invalid status

Raised 400 HTTPBadRequest if user passes invalid status to list
server API. Increased API microversion to v2.38 to maintain
backward compatibility.

Implements: blueprint response-for-invalid-status

Co-Authored-By: Ed Leafe <ed@leafe.com>

Change-Id: I25608280c2f30e70802e173c183de4e8da9a983b

nova/api/openstack/api_version_request.py

@@ -93,6 +93,8 @@ REST_API_VERSION_HISTORY = """REST API Version History:
     * 2.37 - Adds support for auto-allocating networking, otherwise known as
              "Get me a Network". Also enforces server.networks.uuid to be in
              UUID format.
+    * 2.38 - Add a condition to return HTTPBadRequest if invalid status is
+             provided for listing servers.
 """
 
 # The minimum and maximum versions of the API supported
@@ -101,7 +103,7 @@ REST_API_VERSION_HISTORY = """REST API Version History:
 # Note(cyeoh): This only applies for the v2.1 API once microversions
 # support is fully merged. It does not affect the V2 API.
 _MIN_API_VERSION = "2.1"
-_MAX_API_VERSION = "2.37"
+_MAX_API_VERSION = "2.38"
 DEFAULT_API_VERSION = _MIN_API_VERSION
 
 # All the proxy APIs which related network, images and baremetal