1. `#define SOCK_FSTACK 0x1000`
2. when we want to create socket by fstack, we code like this :
`s = ngx_socket(domain, type | SOCK_FSTACK , protocol);`
This commit contains an ipc library implemented by dpdk rte_ring and
sysctl tool ported from FreeBSD.
With this commit we can get and set FreeBSD kernel state in runtime.