Upgrade all rules to no longer use DH_COMPAT, use debian/compat instead,

and change to 4, making slight tweaks where necessary.

r11965

debian/compat

@@ -0,0 +1 @@
+4

debian/rules

@@ -2,19 +2,12 @@
 # Sample debian/rules that uses debhelper.
 # GNU copyright 1997 to 1999 by Joey Hess.
 
-# Uncomment this to turn on verbose mode.
-#export DH_VERBOSE=1
-
-
 PACKAGES=$(shell dh_listpackages)
 VERSION=$(shell dpkg-parsechangelog | grep ^Version: | cut -d ' ' -f 2)
 ARCH=$(shell dpkg --print-architecture)
 
 DHCP_PACKAGES=netcfg netcfg-dhcp
 
-# This is the debhelper compatability version to use.
-export DH_COMPAT=2
-
 # Udebs have no postrm file, don't make one
 export DH_OPTIONS=-n