run: introduce explicit wait_for_output

To be used by base-* run/env scripts
net: add library for performance measurements
net: net_stat instrumented version of iPXE driver
net: net_stat instrumented version of usb_drv
extend genode_until_run for nova, foc, hw
run: add nic driver performance test
Add pingpong test
test_adaptations.diff
run: adjust network test for x86
run: lwip use is_qemu