Support no lsf

Added check for USE_LSF in queue_driver.c, so that it is possible to compile ERT without LSF.

By the way, HAVE_LSF_DRIVER is kinda pointless right now. It will always be ON, since LSF_HEADER will be defined but set to LSF_HEADER-NOTFOUND. Setting HAVE_LSF_DRIVER to OFF also still doesn't make ERT compile.