tests/unittests: add tweetnacl sign/verify test
tests/unittests: add tweetnacl sign/verify test

mfrey/RIOT,OlegHahm/RIOT,authmillenon/RIOT,smlng/RIOT,x3ro/RIOT,miri64/RIOT,rfuentess/RIOT,lazytech-org/RIOT,mtausig/RIOT,OlegHahm/RIOT,miri64/RIOT,basilfx/RIOT,kaspar030/RIOT,avmelnikoff/RIOT,smlng/RIOT,cladmi/RIOT,kbumsik/RIOT,basilfx/RIOT,biboc/RIOT,avmelnikoff/RIOT,josephnoir/RIOT,toonst/RIOT,aeneby/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,rfuentess/RIOT,kbumsik/RIOT,mfrey/RIOT,kaspar030/RIOT,lazytech-org/RIOT,RIOT-OS/RIOT,rfuentess/RIOT,x3ro/RIOT,x3ro/RIOT,yogo1212/RIOT,aeneby/RIOT,neiljay/RIOT,gebart/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,toonst/RIOT,kYc0o/RIOT,ant9000/RIOT,mtausig/RIOT,smlng/RIOT,RIOT-OS/RIOT,BytesGalore/RIOT,BytesGalore/RIOT,BytesGalore/RIOT,gebart/RIOT,BytesGalore/RIOT,aeneby/RIOT,yogo1212/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,cladmi/RIOT,kbumsik/RIOT,A-Paul/RIOT,mtausig/RIOT,josephnoir/RIOT,jasonatran/RIOT,kbumsik/RIOT,basilfx/RIOT,OTAkeys/RIOT,cladmi/RIOT,kaspar030/RIOT,kbumsik/RIOT,gebart/RIOT,ant9000/RIOT,aeneby/RIOT,aeneby/RIOT,ant9000/RIOT,miri64/RIOT,basilfx/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,ant9000/RIOT,toonst/RIOT,neiljay/RIOT,lazytech-org/RIOT,neiljay/RIOT,yogo1212/RIOT,cladmi/RIOT,A-Paul/RIOT,OlegHahm/RIOT,toonst/RIOT,jasonatran/RIOT,authmillenon/RIOT,authmillenon/RIOT,mfrey/RIOT,yogo1212/RIOT,x3ro/RIOT,A-Paul/RIOT,basilfx/RIOT,mfrey/RIOT,smlng/RIOT,mtausig/RIOT,A-Paul/RIOT,biboc/RIOT,OlegHahm/RIOT,miri64/RIOT,A-Paul/RIOT,yogo1212/RIOT,avmelnikoff/RIOT,josephnoir/RIOT,kYc0o/RIOT,avmelnikoff/RIOT,josephnoir/RIOT,OlegHahm/RIOT,rfuentess/RIOT,rfuentess/RIOT,cladmi/RIOT,josephnoir/RIOT,biboc/RIOT,yogo1212/RIOT,ant9000/RIOT,neiljay/RIOT,neiljay/RIOT,x3ro/RIOT,kYc0o/RIOT,gebart/RIOT,toonst/RIOT,OTAkeys/RIOT,kaspar030/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,biboc/RIOT,avmelnikoff/RIOT,miri64/RIOT,kYc0o/RIOT,mfrey/RIOT,BytesGalore/RIOT,authmillenon/RIOT,jasonatran/RIOT,authmillenon/RIOT,biboc/RIOT,lazytech-org/RIOT,gebart/RIOT,smlng/RIOT,mtausig/RIOT