[aclshow] restore PRIO column and sort entries by priority

[romankachur-mlnx]

Signed-off-by: Roman Kachur romankac@mellanox.com

- What I did
I reverted PRIO column to aclshow output.
Set sorting of rules to 'first by Table then by Priority',
before it was 'first by Table then by Counter'.
- How I did it
Added PRIO column to aclshow, changes sorting.
- How to verify it
Load acl rules and run aclshow -a
- Previous command output (if the output of a command-line utility has changed)

RULE NAME     TABLE NAME      PACKETS COUNT    BYTES COUNT
------------  ------------  ---------------  -------------
RULE_9        DATAACL                   901            900
RULE_7        DATAACL                   701            700
RULE_4        DATAACL                   401            400
RULE_3        DATAACL                   301            300
RULE_2        DATAACL                   201            200
RULE_1        DATAACL                   101            100
DEFAULT_RULE  DATAACL                     2              1
RULE_05       DATAACL                     0              0
RULE_6        EVERFLOW                  601            600
RULE_08       EVERFLOW                    0              0

- New command output (if the output of a command-line utility has changed)

RULE NAME     TABLE NAME      PRIO    PACKETS COUNT    BYTES COUNT
------------  ------------  ------  ---------------  -------------
RULE_1        DATAACL         9999              101            100
RULE_2        DATAACL         9998              201            200
RULE_3        DATAACL         9997              301            300
RULE_4        DATAACL         9996              401            400
RULE_05       DATAACL         9995                0              0
RULE_7        DATAACL         9993              701            700
RULE_9        DATAACL         9991              901            900
DEFAULT_RULE  DATAACL            1                2              1
RULE_6        EVERFLOW        9994              601            600
RULE_08       EVERFLOW        9992                0              0

-->

[jleveque]

If we're doing a primary sort by table name then a secondary sort by priority, does it make more sense to move the table name column to the far left, followed by the priority column, then rule name, etc?

[jleveque]

Maybe use the full word, PRIORITY? It's only 4 more chars.

[romankachur-mlnx]

Priority label was "PRIO" long before my changes
#442
This time I just reverted this label, as it was before.