alf_queue_bench: initial skeleton for micro benchmarking

The first results for the absolute fast-path of just enqueue and
dequeue of the same element on the same CPU.

Results from CPU E5-2695:

Type:ALF-simple Per elem: 27 cycles(tsc) 10.910 ns (step:0)
 - (measurement period time:0.218214284 sec time_interval:218214284)
 - (invoke count:20000000 tsc_interval:545534856)

Showing the cost of a enqueue is currently: 10.910 ns (27 cycles(tsc))
For the DPDK ported ring_queue variant is :  9.330 ns (23 cycles(tsc))

Which is fairly close at this early stage of developement of ALF.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>