Upgrade dns/dnsdbq to version 2.5.3:

• Removed probe feature.
• Add note: not all passive DNS systems or versions of those system implement the same query features.
• Remove unreached error msg
• Renamed existing "dnsdb" system to be "dnsdb1". Made "dnsdb" be an alias for "dnsdb2". Restructured parts of the man page

Sponsored by: Farsight Security, Inc.