Log Message:
Updated p5-Net-SNMP to 5.2.0

- Removed the dependency on the IO::Socket::INET and IO::Socket::INET6
  modules.  The IO::Socket module is now used for all socket objects.
- The port information can now be included as part of the transport
  address specified with the session() Transport Domain arguments.
- Added support for specifying the scope zone index for IPv6 addresses
  as described in RFC 4007 - "IPv6 Scoped Address Architecture".
- The default value for the agent-addr in SNMPv1 Trap-PDUs is now the
  IP address associated with the interface on which the trap will be
  transmitted.
- Support of the AES privacy protocol was updated to be compliant with
  RFC 3826 - "The Advanced Encryption Standard (AES) Cipher Algorithm
  in the SNMP User-based Security Model".
- Corrected an issue where any non-blocking SNMPv3 message queued prior
  to calling snmp_dispatcher() was sent with an empty contextEngineID.
- The first SNMPv3 discovery message is again being sent with a zero-
  length msgUserName as suggested by RFC 3414.
- All sockets are now flagged as non-blocking to prevent a possible
  deadlock due to an interaction between recv() and select().
- The sending of messages is now bounded by the receive processing rate
  to avoid receive buffer overflows.
- The return value of select() is now checked for both "undef" and -1.
- The "usm.t" tests are now skipped if any of the non-core modules
  required by the Net::SNMP::Security::USM module are not present.