Add option to specify canned ACL in AWS S3 output configuration
Add option to specify canned ACL in AWS S3 output configuration

    * Adds the option "canned_acl" which defaults to "private"
    * Breaks the previous behaviour where the canned ACL was hard-coded to "public_read".
      Which is a potential security problem, allowing everyone to access the file on S3.

tinglinux/logstash-kafka,Aloomaio/logstash-kafka,opentable/logstash-kafka,joekiller/logstash-kafka,opentable/logstash-kafka,tinglinux/logstash-kafka,joekiller/logstash-kafka,Aloomaio/logstash-kafka