initial changes to use unbound as local dns resolver instead of bind

conf/NetworkManager.conf

@@ -0,0 +1,2 @@
+[main]
+dns=unbound

conf/unbound.conf

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+server:
+      # the working directory.
+      directory: "/etc/unbound"
+
+      # run as the unbound user
+      username: unbound
+
+      verbosity: 0      # uncomment and increase to get more logging.
+      # logfile: "/var/log/unbound.log" # won't work due to apparmor
+      # use-syslog: no
+
+      # By default listen only to localhost
+      #interface: ::1
+      #interface: 127.0.0.1
+      port: 53
+
+      # Only allow localhost to use this Unbound instance.
+      access-control: 127.0.0.1/8 allow
+      access-control: ::1/128 allow
+
+      # Functionality
+      do-ip4: yes
+      do-ip6: yes
+      do-udp: yes
+      do-tcp: yes
+
+      # Performance
+      num-threads: 2
+      cache-min-ttl: 300
+      cache-max-ttl: 86400
+      serve-expired: yes
+      neg-cache-size: 4M
+      msg-cache-size: 50m
+      rrset-cache-size: 100m
+
+      so-reuseport: yes
+      so-rcvbuf: 4m
+      so-sndbuf: 4m
+
+      # Privacy / hardening
+      # hide server info from clients
+      hide-identity: yes
+      hide-version: yes
+      harden-glue: yes
+      harden-dnssec-stripped: yes
+      harden-algo-downgrade: yes
+      harden-large-queries: yes
+      harden-short-bufsize: yes
+
+      rrset-roundrobin: yes
+      minimal-responses: yes
+      identity: "Server" #
+
+remote-control:
+      control-enable: yes
+      control-port: 953