Fix conditional in environment/setup role

Current conditional does not work with Ansible 2.3

Closes-bug: #1701006
Change-Id: Ic86fb5f86fb5db8a721859e5ec85e8b569f17550

roles/environment/setup/tasks/main.yml

@@ -1,5 +1,5 @@
 # If virtualport_type is defined for any networks, include OVS dependencies
-- when: "{{ networks|selectattr('virtualport_type', 'defined')|map(attribute='name')|list|length is greaterthan 0}}"
+- when: networks|selectattr('virtualport_type', 'defined')|map(attribute='name')|list|length > 0
   block:
 
   # Install OVS dependencies
@@ -124,4 +124,3 @@
     path: "{{ working_dir }}"
     state: directory
   become: true
-