Update blazar.conf template

Our blazar.conf template was using some deprecated or removed options.

Change-Id: I611af46794894fe76da5e74a491db3500810341a

ansible/roles/blazar/templates/blazar.conf.j2

 [DEFAULT]
 debug = {{ blazar_logging_debug }}
-
 log_dir = /var/log/kolla/blazar
-
 transport_url = {{ rpc_transport_url }}
-
 host = {{ api_interface_address }}
 port = {{ blazar_api_port }}
 os_auth_host = {{ kolla_internal_fqdn }}
@@ -44,13 +41,8 @@ connection_recycle_time = {{ database_connection_recycle_time }}
 max_pool_size = {{ database_max_pool_size }}
 max_retries = -1
 
-[physical:host]
-on_start = on_start
-on_end = on_end
+[nova]
 aggregate_freepool_name = {{ blazar_aggregate_pool_name }}
-blazar_username = {{ blazar_keystone_user }}
-blazar_password = {{ blazar_keystone_password }}
-blazar_project_name = service
 
 [oslo_messaging_notifications]
 {% if blazar_enabled_notification_topics %}