Log Message:
Update to net-snmp 5.8

*5.8*
    snmplib:
      - TLS/DTLS fixes
      - fix usm keychanges for new algorithms and longer keylengths
      - IP address formatting fixes
      - BUG: 2592: from Stuart Kendrick - increase MAXTC to 16384
      - add new sha2 auth protocols
      - Restore AES-192 and AES-256 privacy protocols - from
        draft-blumenthal-aes-usm-04 (precursor to RFC 3826)
        - Use OIDs from http://www.snmp.com/eso/esoConsortiumMIB.txt
        - Some code borrowed from PATCH 1346, thanks to
          Alexander Ivanov and Vladimir Sukhorukov.
      - BUG: 2622: Fix excessive indents in log file
      - new config tokens:
        - sendMessageMaxSize
        - disableSNMPv1 / disableSNMPv2c
      - new api for dynamic debug log level (netsnmp_set_debug_log_level)

    snmpd:
      - SNMP-TARGET-MIB: Fix snmpTargetAddrTAddress
      - Com2sec and com2sec6 SOURCE values may deny sources as well as
        permit.
      - allow trap sinks to set Target-MIB characteristics (name, tag, profile)
      - add source addr/port option to trapsink/trap2sink/informsink
      - packet filtering by source ip (enableSourceFiltering/filtersource)
      - several getbulk handling improvements
      - several new APIs introduced for run-time configuration of agent:
        - netsnmp_vacm_simple_usm_add/del
        - usm_create_usmUser_*
        - netsnmp_udp_com2SecEntry_create/netsnmp_udp_com2SecList_remove
        - netsnmp_agent_listen_on to open agent port

    Win32:
      - Add support for the DTLS-UDP and TLS-TCP transports

    scripts:
      - A new 'checkbandwidth' script to check host min/max bandwidth

    snmptranslate:
      - Introduce bulk translation mode The special argument "-" causes
        snmptranslate to enter bulk translation mode, in which it expects
        one OID per line.  Whitespace is treated as the end of the OID, and
        only that portion of the line is replaced, meaning that this can be
        used to translate, e.g., "snmpwalk" output without the proper MIBs
        loaded: snmptranslate -m all -OX < numeric.txt > symbolic.txt

    building:
      - Add Travis and Appveyor CI support
      - IPv6 support is now compiled by default.  If you need an IPv4-only
        agent, use --disable-ipv6.
      - Fixed/improved support for several non-Linux platforms
      - Many fixes found by Coverity anf Fortify scans