Revert "Only update packages indexes if the cache is 1 hour old"

This reverts commit 201165cff662caad9b51508272e7f8f2eece7b0c.

Turns out this actually breaks initial deployments, because the
cache gets updated in the first task, then you add sources for
nginx and mariadb, but it doesn't update the indexes because the
cache is < 3600 seconds old, so you end up getting the distro's
versions of nginx and mariadb.

roles/nginx/tasks/main.yml

@@ -8,7 +8,7 @@
   tags: nginx, packages
 
 - name: Install nginx
-  apt: pkg=nginx update_cache=yes state=latest cache_valid_time=3600
+  apt: pkg=nginx update_cache=yes state=latest
   tags: nginx, packages
 
 - name: Copy nginx configs