This makes a whole host of changes. First we install logstash from the
deb packages that are now available. This package sets up the logstash
user, group, logrotate for log files, a conf.d dir, and an init script
for a service for us. This means all of that stuff can be removed from
puppet and be provided by the package instead.
In addition to cleanup related to the package we remove things that no
longer make sense with newer logstash. There is no more logstash web
service for example use kibana instead. Also the distinction between
agent and indexer is no longer strong and logstash has a separate
shipper tool which should be used in place of the agent (though backward
compat for the agent class is preserved by setting it up as an indexer
using an agent config).