distro: clean this up

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

lib/distro.conf

@@ -1,48 +1,22 @@
 #!/bin/bash
 
 unset UBOOTWRAPPER
+NETIMAGE="current"
+NETINSTALL="initrd.gz"
 case "${DISTARCH}-${debian_boot}" in
-trusty-armhf-netboot)
+trusty-armhf-netboot|xenial-armhf-netboot|bionic-armhf-netboot)
 	#http://ports.ubuntu.com/dists/trusty/main/installer-armhf/
-	NETIMAGE="current"
-	HTTP_IMAGE="http://ports.ubuntu.com/ubuntu-ports/dists"
-	BASE_IMAGE="generic/netboot"
-	NETINSTALL="initrd.gz"
-	;;
-xenial-armhf-netboot)
 	#http://ports.ubuntu.com/dists/xenial/main/installer-armhf/
-	NETIMAGE="current"
-	HTTP_IMAGE="http://ports.ubuntu.com/ubuntu-ports/dists"
-	BASE_IMAGE="generic/netboot"
-	NETINSTALL="initrd.gz"
-	;;
-bionic-armhf-netboot)
 	#http://ports.ubuntu.com/dists/bionic/main/installer-armhf/
-	NETIMAGE="current"
 	HTTP_IMAGE="http://ports.ubuntu.com/ubuntu-ports/dists"
 	BASE_IMAGE="generic/netboot"
-	NETINSTALL="initrd.gz"
 	;;
-jessie-armhf-netboot)
+jessie-armhf-netboot|stretch-armhf-netboot|buster-armhf-netboot)
 	#http://ftp.us.debian.org/debian/dists/jessie/main/installer-armhf/
-	NETIMAGE="current"
-	HTTP_IMAGE="http://ftp.debian.org/debian/dists"
-	BASE_IMAGE="netboot"
-	NETINSTALL="initrd.gz"
-	;;
-stretch-armhf-netboot)
 	#http://ftp.us.debian.org/debian/dists/stretch/main/installer-armhf/
-	NETIMAGE="current"
-	HTTP_IMAGE="http://ftp.debian.org/debian/dists"
-	BASE_IMAGE="netboot"
-	NETINSTALL="initrd.gz"
-	;;
-buster-armhf-netboot)
 	#http://ftp.us.debian.org/debian/dists/buster/main/installer-armhf/
-	NETIMAGE="current"
 	HTTP_IMAGE="http://ftp.debian.org/debian/dists"
 	BASE_IMAGE="netboot"
-	NETINSTALL="initrd.gz"
 	;;
 esac
 #