[LUA_SCRIPT] trap_rates.lua get value error

[inspurSDN]

Description:
    1. If the SAI_COUNTER_STAT_PACKETS field in the COUNTERS table in the counter db is 0, it will be calculated as a Boolean value by trap_rates.lua, resulting in a script operation error.

    2. Force in_pkts to be converted into a numerical value before operation

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