[app_server] support tcp stream and don't read conf.xml directly
[ins] prevent drifting of the ins_invariant while waiting first gps data
[nav][gls] initialized target airspeed even if airspeed control is not used
[ardrone2] update script to configure the ardrone2

- network configuration script
- add autoboot install command
- add HOST variable to ardrone2 script's parameter
- fix typo for checking if vision is running