v3 server controller load update extension point without checking right require function

[Alex Xu]

server's controller load the update extension point as below:

       # Look for implmentation of extension point of server update
        self.update_extension_manager = \
            stevedore.enabled.EnabledExtensionManager(
                namespace=self.EXTENSION_UPDATE_NAMESPACE,
                check_func=_check_load_extension('server_resize'),
                invoke_on_load=True,
                invoke_kwds={"extension_info": self.extension_info},
                propagate_map_exceptions=True)
        if not list(self.update_extension_manager):

But it's checking function with wrong params, it should be _check_load_extension('server_update').

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/52014

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/52014
Committed: http://github.com/openstack/nova/commit/edcc7dcbcbfa50a002767d437ea9cf344d1d7a37
Submitter: Jenkins
Branch: master

commit edcc7dcbcbfa50a002767d437ea9cf344d1d7a37
Author: He Jie Xu <email address hidden>
Date: Wed Oct 16 13:56:03 2013 +0800

    Correct update extension point's check_func for v3 server's controller

    When loading update extension point, it should check the extension has
    'server_update' function. But current code check with wrong function
    name 'server_resize'. And this patch adds testcase for servers extension
    point.

    Change-Id: I2bee7ff306b3337d24047e471fac9485fec9a6f7
    Closes-bug: #1240351