First draft of chroot implementation for Debian

- RHEL chroot code has been moved into a bind::chroot::package class

- Debian family (and probably other families) can use the
  `bind::chroot::manual` class to enable chroot for bind using the method
  described here: https://wiki.debian.org/Bind9#Bind_Chroot

examples/chroot.pp

@@ -0,0 +1,13 @@
+class { 'bind':
+    chroot                => true,
+    # Note: this file MUST be into the /etc/named directory so the
+    # RHEL7 specific setup-named-chroot.sh script will make it available into
+    # the chroot.
+    default_zones_include => '/etc/named/default-zones.conf',
+    forwarders            => [
+        '8.8.8.8',
+        '8.8.4.4',
+    ],
+    dnssec                => true,
+    version               => 'Controlled by Puppet',
+}