Unit test for metric configuration model

Signed-off By: Renan Fichberg <rfichberg@gmail.com>
Signed-off By: Guilherme Rojas V. de Lima <guilhermehrojas@gmail.com>
View to create new Metric Configuration.

Pending combobox to basetool, its metrics, reading groups and agregation form.
Still missing to some acceptance tests and fix the ownership helper to metric configuration controller.

signed-off-by: Fellipe Souto Sampaio <fllsouto@gmail.com>
signed-off-by: Renan Fichberg <rfichberg@gmail.com>