[SNMP4J] TcpTransportMapping.close(address) hanging in AIX

[Brice Fines]

Hi Frank,

You were ritght, I had a little mistake in my log4.properties, traces were 
logged twice but methods were only called once.

I had:
log4j.rootLogger=INFO, stdout
log4j.logger.org.snmp4j = DEBUG, stdout

Corrected it to:
log4j.rootLogger=INFO, stdout
log4j.logger.org.snmp4j = DEBUG

(We are using the default ThreadFactory.)
Since method are only called once, maybe the problem is elsewhere.
If you are interested, I could try a snapshot with more detailed logs for 
TcpTransportMapping.close(address) hanging in AIX.

Regards