Run dnsmasq as the dnsmasq user (#1029)

* Run dnsmasq as the dnsmasq user

There is a task that checks whether the dnsmasq user exists.
However, dnsmasq is configured to run as user "nobody" instead.
This change lets dnsmasq run as user "dnsmasq".

* remove dnsmasq user task

roles/dns_adblocking/tasks/main.yml

@@ -8,9 +8,6 @@
     - name: Dnsmasq installed
       package: name=dnsmasq
 
-    - name: Ensure that the dnsmasq user exist
-      user: name=dnsmasq groups=nogroup append=yes state=present
-
     - name: The dnsmasq directory created
       file: dest=/var/lib/dnsmasq state=directory mode=0755 owner=dnsmasq group=nogroup
 

roles/dns_adblocking/templates/dnsmasq.conf.j2

@@ -103,7 +103,7 @@ server={{ host }}
 
 # If you want dnsmasq to change uid and gid to something other
 # than the default, edit the following lines.
-user=nobody
+user=dnsmasq
 group=nogroup
 
 # If you want dnsmasq to listen for DHCP and DNS requests only on