Garbaged SNMP values (apps)
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17. When my PySNMP application prints out fetched values, some of them
    come out as a garbage on my screan. Here's my code:

    for varBind in varBinds:
      print(' = '.join([ str(x) for x in varBind ])

   and the result is:

    1.3.6.1.4.1.161.19.3.2.1.63.0 = 50000
    1.3.6.1.4.1.161.19.3.2.1.4.0 = '\x01\x02\x03\x04'

   The IpAddress type seems to be the only one with this problem.

1. Always use prettyPrint() method for all pyasn1-based objects -- it
   automatically converts ASN1 types to human-friendly form.

   > > > from pysnmp.proto import rfc1902
   > > > a = rfc1902.IpAddress('1.2.3.4')
   > > > str(a)
   '\x01\x02\x03\x04'
   > > > a
   IpAddress('1.2.3.4')
   > > > a.prettyPrint()
   '1.2.3.4'
   > > > rfc1902.IpAddress.prettyPrint(a)
   '1.2.3.4'

See pyasn1 docs for more information on pyasn1 data model.
