[HEAD MERGE] working version with fork(). no resize

Signed-off-by: David Goulet <dgoulet@ev0ke.net>
[MERGE] more fixes. Cleanup code

Signed-off-by: David Goulet <dgoulet@ev0ke.net>
[MERGE] close shm fd at pool destroy

Signed-off-by: David Goulet <dgoulet@ev0ke.net>