test to allow all lua steps to instruct powerdns not to answer a question
Updated global PDNS log table with DROP and PASS values to return on the stack for passthrough. This allows for users issue a dontanswer type to drop and not process any unwanted queries. Updated the example script to reflect changes. Updated the pdns.xml to reflect changes
Merge pull request #1 from zmallen/dontanswer

Dontanswer
Merge pull request #1177 from ahupowerdns/master

dontanswer - lua mode to cause powerdns to drop a packet