[unbound] multi-threading

roles/unbound/templates/unbound.conf.j2

 server:
-	verbosity: {{ unbound['verbosity'] | default(1) }}
+    verbosity: {{ unbound['verbosity'] | default(1) }}
 
 {% for adr in unbound['interfaces'] %}
     interface: {{ adr }}
@@ -12,27 +12,29 @@ server:
 {% endfor %}
 {% endfor %}
 
-	# chroot: "/etc/unbound"
-	# username: "unbound"
-	# directory: "/etc/unbound"
+    # chroot: "/etc/unbound"
+    # username: "unbound"
+    # directory: "/etc/unbound"
+    
+    num-threads: 8
 
-	# the log file, "" means log to stderr.
-	# Use of this option sets use-syslog to "no".
-	# logfile: ""
+    # the log file, "" means log to stderr.
+    # Use of this option sets use-syslog to "no".
+    # logfile: ""
 
-	use-syslog: yes
+    use-syslog: yes
 
-	# Log identity to report. if empty, defaults to the name of argv[0]
-	# (usually "unbound").
-	# log-identity: ""
+    # Log identity to report. if empty, defaults to the name of argv[0]
+    # (usually "unbound").
+    # log-identity: ""
 
-	# print UTC timestamp in ascii to logfile, default is epoch in seconds.
-	# log-time-ascii: no
+    # print UTC timestamp in ascii to logfile, default is epoch in seconds.
+    # log-time-ascii: no
 
-	#log-queries: yes
-	#log-replies: yes
+    #log-queries: yes
+    #log-replies: yes
 
-	root-hints: "root.hints"
+    root-hints: "root.hints"
 
     module-config: "validator iterator"
     auto-trust-anchor-file: "/etc/unbound/root.key"
@@ -42,10 +44,10 @@ server:
 
 
 python:
-	# ...
+    # ...
 
 dynlib:
-	# ...
+    # ...
 
 # Remote control config section.
 remote-control: