Fix SNMP QoS MIB only shows queues 1-6 on platform with 8 ucast/4 mcast queues

[dgodwin-nokia]

(Fix for sonic-net/sonic-buildimage#20033)

- What I did

On some platforms (specifically Broadcom TH4/TH5), there are not an equal number of unicast and multicast queues. Previous code would assume that there was an even number, causing missing snmp counters.

Instead of wrapping multicast values based on maximum number of queues, after this change the wrap is based on number of priority groups.

- How I did it

Modified code to use STATE_DB "max_priority_groups" instead of "max_queues".

- How to verify it
Verified on J2C/TH4/TH5 based platforms.

snmpwalk shows 8 queues, first 4 show multicast counters:

snmpwalk -v2c -c public 100.117.58.28 1.3.6.1.4.1.9.9.580.1.5.5.1.4.1
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.1.1 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.1.2 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.1.3 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.1.4 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.1.5 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.1.6 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.1.7 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.1.8 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.2.1 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.2.2 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.2.3 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.2.4 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.2.5 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.2.6 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.2.7 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.2.8 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.3.1 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.3.2 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.3.3 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.3.4 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.3.5 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.3.6 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.3.7 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.3.8 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.4.1 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.4.2 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.4.3 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.4.4 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.4.5 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.4.6 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.4.7 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.4.8 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.5.1 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.5.2 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.5.5 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.5.6 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.6.1 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.6.2 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.6.5 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.6.6 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.7.1 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.7.2 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.7.5 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.7.6 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.8.1 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.8.2 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.8.5 = Counter64: 0
iso.3.6.1.4.1.9.9.580.1.5.5.1.4.1.2.8.6 = Counter64: 0

- Description for the changelog

Modify SNMP QoS MIB to wrap multicast counters based on maximum number of priority groups.