Do not copy host sudoers in guest.

As noticed by Dmitry Nedospasov (Cf. [1]), sudoers file should not be
copied by default.

Move this hook to a role, and add a warning about this in role.

[1] http://xen-tools.org/pipermail/xen-tools-dev/2010-July/000146.html

hooks/debian/60-copy-host-files

@@ -31,29 +31,6 @@ cp /etc/timezone    ${prefix}/etc
 cp /etc/localtime   ${prefix}/etc
 
 
-#
-# If the host has sudo then copy the configuration file, and install
-# the package
-#
-if [ -e /etc/sudoers ]; then
-
-  logMessage Installing SUDO too.
-
-  #
-  #  Copy file and fixup permissions.
-  #
-  cp /etc/sudoers ${prefix}/etc
-  chown root:root ${prefix}/etc/sudoers
-  chmod 440       ${prefix}/etc/sudoers
-
-  #
-  #  Install sudo
-  #
-  installDebianPackage ${prefix} sudo
-
-fi
-
-
 #
 #  Log our finish
 #