tests/shell: Use socat as the RIOT_TERMINAL.
tests/shell: Use socat as the RIOT_TERMINAL.

For test scripts, a terminal that does not modify the input and output
streams, configured without local echo, is preferred as it ensures the
test setup is introducing as little noise as possible.

OlegHahm/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,cladmi/RIOT,authmillenon/RIOT,kYc0o/RIOT,toonst/RIOT,kaspar030/RIOT,x3ro/RIOT,smlng/RIOT,jasonatran/RIOT,yogo1212/RIOT,mtausig/RIOT,cladmi/RIOT,miri64/RIOT,aeneby/RIOT,mtausig/RIOT,authmillenon/RIOT,yogo1212/RIOT,josephnoir/RIOT,x3ro/RIOT,aeneby/RIOT,toonst/RIOT,smlng/RIOT,x3ro/RIOT,kYc0o/RIOT,basilfx/RIOT,aeneby/RIOT,ant9000/RIOT,jasonatran/RIOT,OTAkeys/RIOT,mtausig/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,yogo1212/RIOT,authmillenon/RIOT,rfuentess/RIOT,miri64/RIOT,basilfx/RIOT,ant9000/RIOT,rfuentess/RIOT,jasonatran/RIOT,josephnoir/RIOT,mtausig/RIOT,josephnoir/RIOT,jasonatran/RIOT,OlegHahm/RIOT,toonst/RIOT,RIOT-OS/RIOT,aeneby/RIOT,kaspar030/RIOT,yogo1212/RIOT,authmillenon/RIOT,x3ro/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,josephnoir/RIOT,kaspar030/RIOT,authmillenon/RIOT,ant9000/RIOT,basilfx/RIOT,smlng/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,yogo1212/RIOT,OlegHahm/RIOT,smlng/RIOT,ant9000/RIOT,kaspar030/RIOT,toonst/RIOT,x3ro/RIOT,toonst/RIOT,aeneby/RIOT,kYc0o/RIOT,cladmi/RIOT,basilfx/RIOT,cladmi/RIOT,OTAkeys/RIOT,miri64/RIOT,yogo1212/RIOT,authmillenon/RIOT,josephnoir/RIOT,OTAkeys/RIOT,mtausig/RIOT,kYc0o/RIOT,cladmi/RIOT,jasonatran/RIOT,miri64/RIOT,ant9000/RIOT,rfuentess/RIOT,miri64/RIOT,rfuentess/RIOT,rfuentess/RIOT,smlng/RIOT,basilfx/RIOT