Make sure fact is available to find hostname

This is related to the fix for BZ# 1988392.  In the fix in
https://review.opendev.org/803147, we changed ansible_hostname to
use an ansible fact without making sure the fact was available.

Change-Id: I75ecbb974e32f8cbec3748cc1eaeea17f6fce7c0

roles/tls_everywhere/tasks/common.yaml

@@ -1,6 +1,14 @@
 ---
 # These tasks apply to all nodes.
 
+- name: Ensure we get needed facts
+  setup:
+    gather_subset:
+      - '!all'
+      - '!any'
+      - '!min'
+      - network
+
 # variable for handlers to clean up
 - name: set facts for handlers to clean up
   set_fact: