[PATCH] Let tftp use differents lts.conf files on same client

Sometimes a guest machine is required to boot LTSP in several ways: thin,fat, autologin...
In this circumstance, a different per-boot configuration file lts.conf is required.
The current lts.conf provides [XX:XX (mac address)] select option, but this is not valid as we allways have the same mac

So I've added a "ltsp.ltsconf=xxx" option for kernel command line at pxegrub boot menu, that lets 05-getltsconffile script to do the work. This option is parsed in 03-kernel-cmdline script and then LTSCONF variable is exported to be used later

Here is the two-line patch:
----------------- cut here ------------
--- /opt/ltsp/i386/usr/share/ltsp/init-ltsp.d/05-getltsconffile 2014-02-27 05:22:36.000000000 +0100
+++ /opt/ltsp/i386/usr/share/ltsp/init-ltsp.d/05-getltsconffile 2014-07-09 09:55:41.724540579 +0200
@@ -9,7 +9,8 @@
     fileonly=${filename##*/}
     pathonly=${filename%$fileonly}
     lts_conf_temp=$(mktemp)
- tftp "$SERVER" -c get ${pathonly:-/ltsp/i386/}lts.conf $lts_conf_temp >/dev/null
+ lts_conf_file=${LTSCONF:-lts.conf}
+ tftp "$SERVER" -c get ${pathonly:-/ltsp/i386/}${lts_conf_file} $lts_conf_temp >/dev/null
     # only overwrite lts.conf if it has non-zero size.
     if [ -s "$lts_conf_temp" ]; then
         mv "$lts_conf_temp" /etc/lts.conf
------------------ cut here ---------------

Tested in Ubuntu 14.04 x64 server with i386 fat/thin client