[RIF] Change rif_rates.lua script to calculate rates correctly

[noaOrMlnx]

Signed-off-by: noaOrMlnx noaor@nvidia.com
What I did
Change rif_rates.lua and port_rates.lua scripts to calculate rates properly - rates_table_names table should be updated after each iteration and not only once.

Why I did it
Fix issue - sonic-net/sonic-buildimage#8392

How I verified it
Checked that when sending traffic, the output of 'show interfaces counters rif' and the rates appear in RATES table, counter db are close.

admin@sonic:~$ show interfaces counters rif -p 5
The rates are calculated within 5 seconds period
    IFACE    RX_OK     RX_BPS    RX_PPS    RX_ERR    TX_OK    TX_BPS    TX_PPS    TX_ERR
---------  -------  ---------  --------  --------  -------  --------  --------  --------
Ethernet0        5  83.90 B/s    1.00/s         1        0  0.00 B/s    0.00/s         0

127.0.0.1:6379[2]> hgetall RATES:oid:0x6000000000d9d
 1) "SAI_ROUTER_INTERFACE_STAT_IN_OCTETS_last"
 2) "3948"
 3) "SAI_ROUTER_INTERFACE_STAT_IN_PACKETS_last"
 4) "47"
 5) "SAI_ROUTER_INTERFACE_STAT_OUT_OCTETS_last"
 6) "0"
 7) "SAI_ROUTER_INTERFACE_STAT_OUT_PACKETS_last"
 8) "0"
 9) "RX_BPS"
10) "77.634107320096575"
11) "RX_PPS"
12) "0.92421556333448329"
13) "TX_BPS"
14) "0"
15) "TX_PPS"
16) "0"

before the change:

admin@sonic:~$ show interfaces  counters rif -p 5
The rates are calculated within 5 seconds period
     IFACE    RX_OK       RX_BPS     RX_PPS    RX_ERR    TX_OK    TX_BPS    TX_PPS    TX_ERR
----------  -------  -----------  ---------  --------  -------  --------  --------  --------
Ethernet0        0     0.00 B/s     0.00/s         0        0  0.00 B/s    0.00/s         0
Ethernet28   29,894  501.05 KB/s  5964.85/s         1        0  0.00 B/s    0.00/s         0

127.0.0.1:6379[2]> hgetall "RATES:oid:0x6000000000517"
1) "SAI_ROUTER_INTERFACE_STAT_IN_OCTETS_last"
2) "17856552"
3) "SAI_ROUTER_INTERFACE_STAT_IN_PACKETS_last"
4) "212578"
5) "SAI_ROUTER_INTERFACE_STAT_OUT_OCTETS_last"
6) "0"
7) "SAI_ROUTER_INTERFACE_STAT_OUT_PACKETS_last"
8) "0"
9) "RX_BPS"
10) "67.774654124880783"
11) "RX_PPS"
12) "0.80684145386762807"
13) "TX_BPS"
14) "0"
15) "TX_PPS"
16) "0"

Details if related

[noaOrMlnx]

/azpw run

[prsunny]

It will be helpful if you can explain the fix. Like what was the output before and what got changed

[noaOrMlnx]

@prsunny Done

[prsunny]

@dgsudharsan to sign-off

[prsunny]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).

[liat-grozovik]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[liat-grozovik]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).