net-snmp 5.8: "unknown snmp version 193" from agentx subagent

The new code in net-snmp 5.8 that tries to account for v1 or v2 trap
sessions logs an error from an agentx subagent, since the agentx code
registers the session as being AGENTX_VERSION_1.  This constant is only
defined in the agentx code, so agent_trap.c doesn't know what it is.

I suspect that this code, which is trying to avoid calling callbacks when
there aren't any sessions of the given version, is irrelevant when using
the built in list of sinks (i.e., when there is no snmp_callback_available(
..., SNMPD_CALLBACK_REGISTER_NOTIFICATIONS ).  However, I don't have a
brilliant idea about how to avoid this error.

1. Change it to a DEBUGMSG. Obviously makes the apparent error not very
visible, but, I don't know if it needs visibility.
2. Register the agentx session using SNMP_VERSION_2c. I assume something
else will break if we pretend it's an SNMP session and not AgentX, but I
haven't tried this.
3. Teach agent_trap.c about AGENTX_VERSION_ numbers.  I don't think anyone
wants to do this, since otherwise the agentx code is encapsulated in
mibgroup/agentx/

Any other ideas?

Thanks,
  Bill

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