Add floating-ip cache expiration time settings

New shade has the ability to batch list floating ips too. Let's use it.

Change-Id: I6a8fa4bca015a9f4bc917dbcf5af5c66a362ced6

modules/openstack_project/templates/nodepool/clouds.yaml.erb

@@ -2,6 +2,7 @@ cache:
   expiration:
     server: 5
     port: 5
+    floating-ip: 5
 clouds:
   rax:
     profile: rackspace

modules/openstack_project/templates/puppetmaster/ansible-clouds.yaml.erb

@@ -5,6 +5,10 @@ ansible:
 cache:
   expiration_time: 86400
   path: /var/cache/ansible-inventory
+  expiration:
+    server: 5
+    port: 5
+    floating-ip: 5
 clouds:
   openstackci-internap:
     region_name: nyj01