Fix Pike nova.conf for HyperV

HyperV Nova needs some nova.conf changes to work properly.
More precisely: 'auth_plugin' becomes 'auth_type'.

Closes-Bug: #1716956
Change-Id: Ic2342e2303b780398f81b3024fe5b11111e34a6e

ansible/roles/nova-hyperv/templates/nova_hyperv.conf.j2

@@ -44,7 +44,6 @@ config_drive_cdrom = true
 dynamic_memory_ratio = 1
 enable_instance_metrics_collection = false
 
-
 [rdp]
 enabled = true
 html5_proxy_base_url = {{ public_protocol }}://{{ kolla_internal_vip_address }}:{{ rdp_port }}
@@ -58,4 +57,4 @@ user_domain_name = default
 username = {{ neutron_keystone_user }}
 password = {{ neutron_keystone_password }}
 auth_url = {{ keystone_admin_url }}/v3
-auth_plugin = v3password
+auth_type = v3password