backlog/107

Implements the issue https://github.com/telefonicaid/fiware-connectors/issues/107
The problem with such a section is that the Flume configuration of the elements will be "distributed" among many sections. I mean, currently, all the configuration regarding a sink is written as a configuration "block", and all you need to know about that sink is "within" that block. By using a "non editable" section we will have a mesh of Flume elements configurations...