Update hyperv spawn() signature

[Mark McLoughlin]

In nova.virt.driver:

    def spawn(self, context, instance, image_meta, injected_files,
              admin_password, network_info=None, block_device_info=None):

in nova.virt.hyperv.driver

    def spawn(self, context, instance, image_meta, network_info,
        block_device_info=None):

i.e. missing network_info and admin_password

Regression caused by https://review.openstack.org/11282

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/12322

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/12322
Committed: http://github.com/openstack/nova/commit/241dad3e0e647c9200b46c8bc0fc4868a66483b8
Submitter: Jenkins
Branch: master

commit 241dad3e0e647c9200b46c8bc0fc4868a66483b8
Author: Mark McLoughlin <email address hidden>
Date: Mon Sep 3 16:43:37 2012 +0100

    Fix hyperv driver spawn() signature

    Fixes bug #1045392

    commit 99fb9d2a changed the signature of the spawn() method but not
    all drivers were updated for the change.

    The injected_files and admin_password instance attributes were ignored
    by the hyperv driver before, so we can just ignore them in spawn() now
    that they are being passed as function arguments.

    Change-Id: I129d21316488a18a4f062252ba5f788bc65c7c25