define local_dns if dns tag used (#533)

algo

@@ -40,7 +40,7 @@ read -p "
 Do you want to install a DNS resolver on this VPN server, to block ads while surfing?
 [y/N]: " -r dns_enabled
 dns_enabled=${dns_enabled:-n}
-if [[ "$dns_enabled" =~ ^(y|Y)$ ]]; then ROLES+=" dns"; EXTRA_VARS+=" local_dns=Y"; fi
+if [[ "$dns_enabled" =~ ^(y|Y)$ ]]; then ROLES+=" dns"; fi
 
 read -p "
 Do you want each user to have their own account for SSH tunneling?

roles/dns_adblocking/tasks/main.yml

@@ -1,5 +1,10 @@
 ---
 - block:
+
+    - name: The DNS tag is defined
+      set_fact:
+        local_dns: Y
+
     - name: Dnsmasq installed
       package: name=dnsmasq