The new option logstash_syslog_input_enabled has been added which will
allow users to enable a direct syslog input. When enabled, messages will
be processed via logstash and sent directly to elasticsearch.
Change-Id: Icb7712ecb8aae3d7f99df80ae1c5cd647a15ce83
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>