Implementation of a method to check whether the current routing paths have changed.

[fdojurado]

Check whether the current routing paths have changed. This is needed to decide to send NC packets or not.

[fdojurado]

This is solved in 1816846.

The method named "check_routes_changed" returns a dataframe with all routes not found in the current routing table.

[fdojurado]

The method "check_routes_changed" needs to be revised. This method is built with the assumption that previous routes (historical routes in the DB) have been deployed. We need to check whether routes are already deployed in the sensor or not.

[fdojurado]

This issue is now fixed in 3562f61