Create a ceph output plugin based on the S3 plugin.

[ph]

Having the possibility to send events to a ceph endpoint has been a really requested feature to add to Logstash especially since ceph implements a compatible S3 API. There was work on the S3 output to actually add that feature. After discussing with @jordansissel @suyograo and @acchen97, we have agreed that we need to provide that feature to our users and we have decided to do the following step:

• Make a new plugin called logstash-output-ceph
• Define ceph specific option in that plugin.
• Reuse the S3 output classes as much as possible.

Creating a new plugin will make sure that the options are well defined for that new endpoint.

[gaul]

Why does Ceph need its own plugin? Most S3 tools allow users to configure endpoints for either AWS, Ceph, or other implementations.