Log Message:
Update snort to 1.8.6.  Patch provided in private mail by Mipam
<mipam@ibb.net>.  From the release notes:

    1.8.4 and 1.8.5 both had bugs that were found right as we were ready
    to do a full release and represented good midway points but 1.8.6
    should be the stable target.

Changes include:
  * The ICMP decoders have been rewritten.
  * (This is a summary of recent changes -- not all mine)
  * Fixed stream4 offset initialization
  * Double Open of snort log file
  * Lots of new rules
  * Fatal error on problems other than -> and <>
  * Fixed stream4 several low memory conditions
  * Error checking in stream4/frag2 argument parsing
  * snort-db schema updates to 1.05
  * --with-pcap-includes should now look at specified pcap
  * packet statistics now should be more accurate with regards to lost
    frags
  * double PID file write
  * S4 alignment problems on SPARC fixed ( rpc_decode still has SPARC
  alignment errors )
  * new snmptrap code
  * documentation updates
  * Stability fixes in frag2
  * SEQ / ACK checking should be correct
  * Reassembled packets with stream4 will now also be inspected when
    using -z est
  * ip fragments are now calculated correctly
  * rule headers correctly matched
    ( multiple CIDR performance greatly increased )