facts: only look up prefixes and VLANs once

Also drop "access-*" hosts from setup playbook as they have all been
renamed to "sw-*".

roles/facts/tasks/main.yml

@@ -1,5 +1,8 @@
 # Make expensive lookups to NetBox once for later reference by any host.
+- delegate_to: localhost
+  block:
     - name: Lookup networks and prefixes
+      run_once: true
       set_fact:
         vlans: '{{ query("netbox.netbox.nb_lookup", "vlans", api_filter="group=new-net", raw_data=true)
             | sort(attribute="vid") }}'

setup.yml

@@ -17,7 +17,7 @@
     - exit
 
 # Set up access switches.
-- hosts: access-*, sw-*
+- hosts: sw-*
   gather_facts: false
   roles:
     - access