Merge remote-tracking branch 'origin/develop_integration_2018_w12' into develop

Summary of changes:
- free configmodule memory when shutting down
  It is possible to restart the lte-softmodem via the FlexRAN controller.
  For this to work, the end_configmodule() method needs to be called when
  shutting the lte-softmodem down so that the configuration can be read
  again during a restart.
- Feature agent
  Implements an agent ID, consisting of the OAI module ID, the OAI eNB ID
  and the cell ID. The agent reads this information in its configuration
  read function and forwards it to the controller.
  This MR also contains some code forwarding SI info to the controller.
- various bugs fixed
  - remove start_background_system from eNB softmodem
  - fix memory leak when doing traffic
  - disable ITTI dump (does someone uses this?)
  - disable U-plane inactivity timer: it's very simple to put this back,
    but as of now it comes with its own problems that we don't have time
    to check/fix