CC-2603: Store log for full install into a file

- done

install_full/ubuntu/airtime-full-install

@@ -1,8 +1,11 @@
-#!/bin/sh
+#!/bin/bash
 #
 # Auto install script for airtime on Ubuntu
 #
 
+exec > >(tee install_log.txt)
+exec 2>&1
+
 if [ "$(id -u)" != "0" ]; then
 	echo "You need admin previlege to run this script"
 	echo "Syntaxe: sudo $0"