tests: enhance xtimer_msg, remove timex
tests: enhance xtimer_msg, remove timex

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