Fix playbooks for Ansible 2.9

The version_compare filter was renamed to version and changed to be a
test in 2.5. The old filter was removed in 2.9.

TrivialFix

Change-Id: Ib5d91b5fc53d0f6d16dd6eb38121cd9914e33d93

ansible/roles/neutron/defaults/main.yml

@@ -228,7 +228,7 @@ neutron_agent_dimensions_python2:
       hard: 16384
 
 neutron_agent_dimensions: >-
-  {{ default_container_dimensions | combine(neutron_agent_dimensions_python2 if distro_python_version | version_compare('3.0', '<') else {}) }}
+  {{ default_container_dimensions | combine(neutron_agent_dimensions_python2 if distro_python_version is version('3.0', '<') else {}) }}
 
 neutron_dhcp_agent_dimensions: "{{ neutron_agent_dimensions }}"
 neutron_l3_agent_dimensions: "{{ neutron_agent_dimensions }}"