fix snmp overriding of auto-configured table fields #4208
Merged
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Whenever the snmp plugin was configured with a table with automatic field discovery, if one of those fields was explicitly overridden in the config and the value of is_tag was changed, the field would be duplicated, once as a tag & once as a field.
This change fixes the behavior so that if a field is explicitly configured, automatic table field discovery doesn't touch it.
Fixes #4203
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