SNMPv2c Trap/Inform uses sysObjectID.0 instead of snmpTrapOID.0

[sebera]

SNMPv2c Trap/Inform packets generated by SNMPTrap use the wrong OID for the second mandatory varbind.

Expected varbinds:

1. .1.3.6.1.2.1.1.3.0 sysUpTime.0
2. .1.3.6.1.6.3.1.1.4.1.0 snmpTrapOID.0

Actual varbinds:

1. .1.3.6.1.2.1.1.3.0 sysUpTime.0
2. .1.3.6.1.2.1.1.2.0 sysObjectID.0

Net-SNMP reports:
Cannot find TrapOID in TRAP2 PDU

Fix:
Initialize internal snmpTrapOID with:
.1.3.6.1.6.3.1.1.4.1.0

instead of:
.1.3.6.1.2.1.1.2.0