unbound: bump verbosity up to 3

Some users are having issues resolving *.auro.re domains from our
network, and the bug does not show itself reliably. Increased verbosity
should help us pinpoint its source.

roles/unbound/templates/recursive.conf.j2

@@ -5,7 +5,7 @@ server:
     log-time-ascii: yes
 
     # Only log errors.
-    verbosity: 0
+    verbosity: 3
 
     # "" sends logs to stderr, journalctl will pick things up.
     logfile: ""