Adds keypair type in nova-api

X509 certificates are used by Windows for passwordless
authentication (WinRM) in a way which can be considered
consistent with the usage of SSH keys on Linux, as both
are based on public / private keypairs.

Enables nova-api to return the keypair type, updates
nova-api version to reflect the changes and updates the
unit and functional tests to validate the API changes.

Unit tests have been updated to ensure that the keypair
type is not being returned on previous API versions.

Note: x509 keypair implementation is added in the next
commit.

DocImpact - See nova/api/openstack/rest_api_version_history.rst
for details

APIImpact

Depends-On: Id5b210d7afe5c0a590abcbd42b9ff85b071a5c55

Co-Authored-By: Chris Yeoh <cyeoh@au1.ibm.com>
Partially implements: blueprint keypair-x509-certificates

Change-Id: I215662f2f92a01921a866c3218031787a9eaf915

nova/api/openstack/api_version_request.py

@@ -38,6 +38,8 @@ from nova import exception
 REST_API_VERSION_HISTORY = """REST API Version History:
 
     * 2.1 - Initial version. Equivalent to v2.0 code
+    * 2.2 - Adds (keypair) type parameter for os-keypairs plugin
+            Fixes success status code for create/delete a keypair method
 """
 
 # The minimum and maximum versions of the API supported
@@ -46,7 +48,7 @@ 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 = "2.1"
+_MAX_API_VERSION = "2.2"
 DEFAULT_API_VERSION = _MIN_API_VERSION