Fix: Set the Reportable flag in trap.IsInform messages #517
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Per RFC 3414 Section 4:
When sending an SNMPv3 InformRequest, the Reportable flag MUST be set in MsgFlags.
This ensures that the authoritative engine will return a Report PDU containing
engineBoots and engineTime for time synchronization which is required before
authenticated communication can succeed. Without this, the engine may reject
the Inform as out-of-time-window or unknown engine.