Added fake uloop API which provides timers, but no fds (for obvious reasons).
First draft of net_sim which uses fake_uloop.
Disable intermediate timeouts in hncp_sd - we're interested only about the end result.
Added more iterations - new fake uloop semantics cause internal message passing to add to iterations too.
Some streamlining of the net_sim code - rewrote WHILE loop to be simpler and got rid of unused functions.
Got rid of test_hncp_pa; not applicable with current code, but hncp_pa <> pa interface is just too tightly bound now. Too bad.