Replace resolvconf with simpler NetworkManager and dhclient configuration.

Refs: #7708

config/chroot_local-hooks/17-clean_up_resolvconf

-#!/bin/sh
-
-set -e
-
-echo "Removing traces of the nameservers used when building"
-
-rm /etc/resolvconf/resolv.conf.d/original

config/chroot_local-hooks/52-update-rc.d

@@ -14,7 +14,6 @@ i2p
 kexec-load
 laptop-mode
 memlockd
-resolvconf
 saned
 spice-vdagent
 tor

config/chroot_local-hooks/99-zzz_resolvconf

-#!/bin/sh
-
-set -e
-
-echo "Removing resolv.conf symbolic link"
-rm /etc/resolv.conf

config/chroot_local-includes/etc/NetworkManager/conf.d/dns.conf

+[main]
+dns=none

config/chroot_local-includes/etc/dhcp/dhclient-enter-hooks.d/disable_make_resolv_conf

+make_resolv_conf() { : ; }

config/chroot_local-includes/etc/resolvconf/interface-order

-# interface-order(5)

config/chroot_local-includes/lib/live/config/0000-resolv-conf

-#!/bin/sh
-
-Configure_resolv_conf ()
-{
-
-	echo -n " resolv-conf"
-	rm -f /etc/resolv.conf
-	ln -s /etc/resolvconf/run/resolv.conf /etc/resolv.conf
-
-	# Creating state file
-	touch /var/lib/live/config/resolv-conf
-}
-
-Configure_resolv_conf

config/chroot_local-packageslists/tails-common.list

@@ -195,7 +195,6 @@ pulseaudio
 pulseaudio-utils
 pwgen
 p7zip-full
-resolvconf
 rfkill
 sane-utils
 scdaemon

config/chroot_local-patches/keep_resolvconf_on_shutdown.diff

-Tails specific: no need to stop properly on shutdown, we are amnesic.
-
---- chroot.orig/etc/init.d/resolvconf	2012-09-24 10:05:13.285055205 +0200
-+++ chroot/etc/init.d/resolvconf	2012-09-24 10:47:23.717869294 +0200
-@@ -9,1 +9,1 @@
--# Default-Stop:      0 6
-+# Default-Stop:

wiki/src/contribute/design/Tor_enforcement/DNS.mdwn

@@ -19,9 +19,13 @@ An exception to the above DNS configuration is the `clearnet` user
 used to run the [[contribute/design/Unsafe_Browser]], which uses the
 DNS server provided for DHCP for resolving.
 
-[resolvconf](http://alioth.debian.org/projects/resolvconf/) is used to
-configure the system resolver in `/etc/resolv.conf`; it is also set up
-to prevent NetworkManager and dhcp-client to modify this file.
+`resolv.conf` is configured to point to the Tor DNS resolver, and <span
+class="application">NetworkManager<span> and `dhclient` are configured
+not to manage `resolv.conf` at all:
+
+* [[!tails_gitweb config/chroot_local-includes/etc/resolv.conf]]
+* [[!tails_gitweb config/chroot_local-includes/etc/NetworkManager/conf.d/dns.conf]]
+* [[!tails_gitweb config/chroot_local-includes/etc/dhcp/dhclient-enter-hooks.d/disable_make_resolv_conf]]
 
 Since the Tor DNS resolver lacks support for most types of DNS queries
 except "A", [ttdnsd](https://www.torproject.org/ttdnsd/) is also
@@ -37,9 +41,6 @@ considered, but doing so would give too much power to a single
 third-party, that is to the organization or people that runs the
 recursive DNS resolver ttdnsd is configured to use.
 
-- [[!tails_gitweb config/chroot_local-includes/etc/resolvconf/resolv.conf.d/base]]
 - [[!tails_gitweb config/chroot_local-includes/etc/tor/torrc]]
 - [[!tails_gitweb config/chroot_local-includes/etc/firewall.conf]]
-- [[!tails_gitweb config/chroot_local-includes/lib/live/config/000-resolv-conf]]
-- [[!tails_gitweb config/chroot_local-hooks/99-zzz_resolvconf]]
 - [[!tails_gitweb config/chroot_local-includes/etc/default/ttdnsd]]