new file: prep/hp/61_save_network_drivers_in_use.sh: list network drivers in use (HP-UX 11.31)
new file: install/hp/29_include_drivers_in_update_ux.sh: populate string network_bundles (using file network.drivers)
modified: install/hp/30_install_bundles.sh: update/ux also includes $network_bundles