Add acl ID into the samples

[dimage1]

What do you think about adding an extra field (acl id) into the stored TCP samples (samples.h)?
This will help with traffic / rules analysis and debug, as well as with security incidents investigations.

Current samples show

in_iface   out_iface  proto  src_addr      src_port  dst_addr  dst_port
---------  ---------  -----  ------------  --------  --------  --------
kni1.3000  kni0.3000  tcp    7.7.7.7        1076     6.6.6.6   56789     
kni1.3001  kni0.3001  tcp    8.8.8.8        1308     1.2.3.4   12345

proposed samples show

in_iface   out_iface  proto  src_addr     src_port  dst_addr  dst_port  acl_id
---------  ---------  -----  -----------  --------  --------  --------  --------   
kni1.3000  kni0.3000  tcp    7.7.7.7       1076     6.6.6.6    56789    100
kni1.3001  kni0.3001  tcp    8.8.8.8       1308     1.2.3.4    12345     95

---

The field is already presented inside the internal structure.

struct sample_base_t
{
         ...
	uint16_t acl_id;

It's just not saved and not used at all.