Add support for BPF_PROG_TYPE_CGROUP_SOCK

[dave-tucker]

Tested and it works.
Sample BPF code:

#[cgroup_sock]
pub fn cgroup_sock(ctx: SockContext) -> i32 {
    match try_cgroup_sock(ctx) {
        Ok(ret) => ret,
        Err(ret) => ret,
    }
}

fn try_cgroup_sock(ctx: SockContext) -> Result<i32, i32> {
    unsafe {
        let family = (*(ctx.sock)).family;
        let type_ = (*(ctx.sock)).type_;
        let protocol = (*(ctx.sock)).protocol;
        // let src_port = (*(ctx.sock)).src_port;
        let dst_port = (*(ctx.sock)).dst_port;
        
        if family == AF_INET {
            // let src_ipv4  = (*(ctx.sock)).src_ip4;
            let dst_ipv4 = (*(ctx.sock)).dst_ip4;
        
            info!(&ctx, "got a sock create event: family: {}, type: {}, proto: {}, dip {}, dport {}",       
            family,
            type_,
            protocol,
            //src_ipv4,
            dst_ipv4,
            //src_port,
            dst_port,
            )
        }
    }
    Ok(0)
}

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