[202311][lldp-syncd] Fix unexpected exception in snmp-subagent (#64) #67
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cherry-pick #64
Separate deleted and changed scearios
deleted interfaces, delete their table key
changed interfaces
if lldp_rem_time_mark is only changed key, just use hset its new value. Don't delete interface table key. If other keys are changed as well, delete interface key and use hmset to set the whole dict into DB, instead of using hset each item one by one. This will avoid interface exists but some of its keys are not added.