Merge "Remove ironic_host_manager usage"

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

@@ -252,10 +252,6 @@ secure_proxy_ssl_header = HTTP_X_FORWARDED_PROTO
 max_attempts = 10
 discover_hosts_in_cells_interval = 60
 
-{% if enable_ironic | bool %}
-host_manager = ironic_host_manager
-{% endif %}
-
 {% if enable_nova_fake | bool %}
 default_filters = RetryFilter,AvailabilityZoneFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter
 {% endif %}