Updating ironic configurations in nova.conf

Irnoic configurations in nova compute node have been changed with
respect to the master code of ironic and nova. admin_url
configuration is with v3 version but other details are with
respect to v2.0 version of keystone authentication.
Updated scheduler_host_manager, compute_driver and admin_url
values in the nova.conf template to support ironic master
branch code.

Change-Id: I78bee3fdf082bcd526507b479be3afaee80ba899
Closes-Bug: #1619211

ansible/roles/nova/templates/nova.conf.j2

@@ -34,11 +34,11 @@ linuxnet_interface_driver = nova.network.linux_net.NeutronLinuxBridgeInterfaceDr
 allow_resize_to_same_host = true
 
 {% if enable_ironic | bool %}
-scheduler_host_manager = nova.scheduler.ironic_host_manager.IronicHostManager
+scheduler_host_manager = ironic_host_manager
 {% endif %}
 
 {% if service_name == "nova-compute-ironic" %}
-compute_driver = nova.virt.ironic.IronicDriver
+compute_driver = ironic.IronicDriver
 vnc_enabled = False
 ram_allocation_ratio = 1.0
 reserved_host_memory_mb = 0
@@ -93,7 +93,7 @@ html5proxy_port = {{ nova_spicehtml5proxy_port }}
 [ironic]
 admin_username = {{ ironic_keystone_user }}
 admin_password = {{ ironic_keystone_password }}
-admin_url = {{ openstack_auth.auth_url }}
+admin_url = {{ openstack_auth.auth_url }}/v2.0
 admin_tenant_name = service
 api_endpoint = {{ internal_protocol }}://{{ kolla_internal_fqdn }}:{{ ironic_api_port }}/v1
 {% endif %}