CC-2806: Create upgrade template file

-missing function
-comment out redundant code

install_minimal/airtime-install

@@ -33,10 +33,8 @@ python ${SCRIPTPATH}/../python_apps/create-pypo-user.py
 set +e
 php --php-ini ${SCRIPTPATH}/airtime-php.ini ${SCRIPTPATH}/include/airtime-install.php $@
 result=$?
-if [ "$result" -eq "2" ]; then
-    #We've just finished an upgrade, so let's exit
-    exit 0
-elif [ "$result" -ne "0" ]; then
+
+if [ "$result" -ne "0" ]; then
     #There was an error, exit with error code.
     echo "There was an error during upgrade. Exit code $result"
     exit 1