Garbaged SNMP values (tools)
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17. When fetching data with snmp*.py command-line tools, some values
    do not print out nicely:

    $ snmpget.py -v2c -c public 127.0.0.1 .1.3.6.1.4.1.14988.1.1.1.2.1.1.0.23.183.34.8.200.3
    SNMPv2-SMI::enterprises.14988.1.1.1.2.1.1.0.23.183.34.8.200.3 =
    OctetString: Ë‡ÄŒ

   where Net-SNMP gives nicely formatted human-readable string:

    $ snmpget -v2c -c public 127.0.0.1 .1.3.6.1.4.1.14988.1.1.1.2.1.1.0.23.183.34.8.200.3
    SNMPv2-SMI::enterprises.14988.1.1.1.2.1.1.0.23.183.34.8.200.3 =
    Hex-STRING: 00 17 B7 22 08 C8

   What can be done to PySNMP to make it returning HEX data in human-readable?

1. The difference is that Net-SNMP prints values into hex by-default,
   whereas pysnmp does not do that. You can force snmpget.py to work
   similarily with the -OT command line parameter.

   $ snmpget.py -OT -v2c -c public 127.0.0.1 .1.3.6.1.4.1.14988.1.1.1.2.1.1.0.23.
   183.34.8.200.3
   SNMPv2-SMI::enterprises.14988.1.1.1.2.1.1.0.23.183.34.8.200.3 =
   OctetString: 00 17 b7 22 08 c8

Another matter is MIB lookup - when snmp*.py tool can use a MIB to
figure out what are the display conventions for particular value type,
it will reformat the value in a human-readable form.

To let MIB lookup work, please pass appropriate MIB name to snmp*.py
tool through command line:

   $ snmpwalk.py -m IP-MIB,IF-MIB -v2c -c public 127.0.0.1 .1.3.6.1.4.1
