Use lbaas alias instead of the class name

Plugin alias is recommended to use.

TrivialFix

Change-Id: I2b8cb9a8e70e6310000bf6b9ad731f85cbf9e04b

ansible/roles/neutron/templates/neutron.conf.j2

@@ -32,7 +32,7 @@ host = {{ ansible_hostname }}_{{ item }}
 
 allow_overlapping_ips = true
 core_plugin = ml2
-service_plugins = router{% if enable_neutron_lbaas | bool %},neutron_lbaas.services.loadbalancer.plugin.LoadBalancerPluginv2{% endif %}{% if enable_neutron_qos | bool %},qos{% endif %}
+service_plugins = router{% if enable_neutron_lbaas | bool %},lbaas{% endif %}{% if enable_neutron_qos | bool %},qos{% endif %}
 
 {% if enable_neutron_lbaas | bool %}
 [service_providers]