tests: use correct PID for main thread
tests: use correct PID for main thread

Since PIDs are not beginning at 0 any more, this test was failing.

kushalsingh007/RIOT,openkosmosorg/RIOT,shady33/RIOT,jasonatran/RIOT,tdautc19841202/RIOT,openkosmosorg/RIOT,rfswarm2/RIOT,katezilla/RIOT,jbeyerstedt/RIOT-OTA-update,ks156/RIOT,x3ro/RIOT,smlng/RIOT,biboc/RIOT,ant9000/RIOT,authmillenon/RIOT,dhruvvyas90/RIOT,sumanpanchal/RIOT,BytesGalore/RIOT,rfswarm/RIOT,alex1818/RIOT,phiros/RIOT,Osblouf/RIOT,msolters/RIOT,ant9000/RIOT,adrianghc/RIOT,daniel-k/RIOT,hamilton-mote/RIOT-OS,kushalsingh007/RIOT,thiagohd/RIOT,gebart/RIOT,kb2ma/RIOT,backenklee/RIOT,mfrey/RIOT,kbumsik/RIOT,automote/RIOT,ThanhVic/RIOT,roberthartung/RIOT,zhuoshuguo/RIOT,neiljay/RIOT,ximus/RIOT,binarylemon/RIOT,neiljay/RIOT,yogo1212/RIOT,kbumsik/RIOT,abp719/RIOT,DipSwitch/RIOT,brettswann/RIOT,rousselk/RIOT,RubikonAlpha/RIOT,jfischer-phytec-iot/RIOT,katezilla/RIOT,dailab/RIOT,fnack/RIOT,haoyangyu/RIOT,malosek/RIOT,herrfz/RIOT-old,adjih/RIOT,aeneby/RIOT,Josar/RIOT,emmanuelsearch/RIOT,latsku/RIOT,locicontrols/RIOT,LudwigOrtmann/RIOT,jbeyerstedt/RIOT-OTA-update,lebrush/RIOT,MohmadAyman/RIOT,emmanuelsearch/RIOT,kushalsingh007/RIOT,ntrtrung/RIOT,herrfz/RIOT,fnack/RIOT,koenning/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,jbeyerstedt/RIOT-OTA-update,OTAkeys/RIOT,TobiasFredersdorf/RIOT,Darredevil/RIOT,centurysys/RIOT,Yonezawa-T2/RIOT,toonst/RIOT,lebrush/RIOT,brettswann/RIOT,luciotorre/RIOT,bartfaizoltan/RIOT,avmelnikoff/RIOT,msolters/RIOT,toonst/RIOT,wentaoshang/RIOT,A-Paul/RIOT,mziegert/RIOT,rousselk/RIOT,biboc/RIOT,khhhh/RIOT,cladmi/RIOT,neumodisch/RIOT,LudwigOrtmann/RIOT,MarkXYang/RIOT,daniel-k/RIOT,shady33/RIOT,Darredevil/RIOT,Lexandro92/RIOT-CoAP,ntrtrung/RIOT,nsol-nmsu/RIOT,patkan/RIOT,A-Paul/RIOT,FrancescoErmini/RIOT,lebrush/RIOT,yogo1212/RIOT,d00616/RIOT,binarylemon/RIOT,kushalsingh007/RIOT,thiagohd/RIOT,jremmert-phytec-iot/RIOT,roberthartung/RIOT,FrancescoErmini/RIOT,thiagohd/RIOT,x3ro/RIOT,ThanhVic/RIOT,miri64/RIOT,l3nko/RIOT,sgso/RIOT,kbumsik/RIOT,benoit-canet/RIOT,jhollister/RIOT,PSHIVANI/Riot-Code,cladmi/RIOT,josephnoir/RIOT,robixnai/RIOT,mfrey/RIOT,LudwigOrtmann/RIOT,immesys/RiSyn,benoit-canet/RIOT,LudwigOrtmann/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,FrancescoErmini/RIOT,1blankz7/RIOT,Ell-i/RIOT,gbarnett/RIOT,katezilla/RIOT,jasonatran/RIOT,robixnai/RIOT,centurysys/RIOT,emmanuelsearch/RIOT,shady33/RIOT,miri64/RIOT,smlng/RIOT,RBartz/RIOT,mtausig/RIOT,alex1818/RIOT,AnonMall/RIOT,khhhh/RIOT,Josar/RIOT,RBartz/RIOT,MonsterCode8000/RIOT,dkm/RIOT,jfischer-phytec-iot/RIOT,locicontrols/RIOT,rajma996/RIOT,binarylemon/RIOT,alignan/RIOT,aeneby/RIOT,tdautc19841202/RIOT,toonst/RIOT,1blankz7/RIOT,zhuoshuguo/RIOT,khhhh/RIOT,zhuoshuguo/RIOT,abp719/RIOT,neiljay/RIOT,kb2ma/RIOT,haoyangyu/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,basilfx/RIOT,tfar/RIOT,jfischer-phytec-iot/RIOT,lazytech-org/RIOT,patkan/RIOT,FrancescoErmini/RIOT,jremmert-phytec-iot/RIOT,brettswann/RIOT,rajma996/RIOT,LudwigOrtmann/RIOT,immesys/RiSyn,d00616/RIOT,herrfz/RIOT-old,EmuxEvans/RIOT,jfischer-phytec-iot/RIOT,OlegHahm/RIOT,mfrey/RIOT,kb2ma/RIOT,automote/RIOT,herrfz/RIOT,marcosalm/RIOT,abp719/RIOT,asanka-code/RIOT,JensErdmann/RIOT,ant9000/RIOT,kb2ma/RIOT,sgso/RIOT,backenklee/RIOT,sumanpanchal/RIOT,Lexandro92/RIOT-CoAP,1blankz7/RIOT,beurdouche/RIOT,gbarnett/RIOT,jfischer-phytec-iot/RIOT,khhhh/RIOT,MarkXYang/RIOT,Yonezawa-T2/RIOT,latsku/RIOT,neumodisch/RIOT,1blankz7/RIOT,RIOT-OS/RIOT,watr-li/RIOT,sgso/RIOT,RubikonAlpha/RIOT,abkam07/RIOT,Yonezawa-T2/RIOT,haoyangyu/RIOT,smlng/RIOT,binarylemon/RIOT,rakendrathapa/RIOT,MonsterCode8000/RIOT,hamilton-mote/RIOT-OS,x3ro/RIOT,malosek/RIOT,rfswarm/RIOT,altairpearl/RIOT,patkan/RIOT,msolters/RIOT,gebart/RIOT,msolters/RIOT,ThanhVic/RIOT,gbarnett/RIOT,beurdouche/RIOT,A-Paul/RIOT,robixnai/RIOT,gebart/RIOT,arvindpdmn/RIOT,kushalsingh007/RIOT,rfswarm2/RIOT,kaspar030/RIOT,kerneltask/RIOT,jasonatran/RIOT,kaleb-himes/RIOT,ntrtrung/RIOT,ThanhVic/RIOT,avmelnikoff/RIOT,changbiao/RIOT,sgso/RIOT,BytesGalore/RIOT,brettswann/RIOT,emmanuelsearch/RIOT,mziegert/RIOT,biboc/RIOT,patkan/RIOT,rakendrathapa/RIOT,dailab/RIOT,jhollister/RIOT,Lexandro92/RIOT-CoAP,lebrush/RIOT,hamilton-mote/RIOT-OS,LudwigKnuepfer/RIOT,Darredevil/RIOT,centurysys/RIOT,kYc0o/RIOT,syin2/RIOT,PSHIVANI/Riot-Code,BytesGalore/RIOT,changbiao/RIOT,TobiasFredersdorf/RIOT,fnack/RIOT,l3nko/RIOT,rousselk/RIOT,chris-wood/RIOT,JensErdmann/RIOT,alignan/RIOT,daniel-k/RIOT,haoyangyu/RIOT,MarkXYang/RIOT,changbiao/RIOT,tdautc19841202/RIOT,jhollister/RIOT,ant9000/RIOT,EmuxEvans/RIOT,DipSwitch/RIOT,dhruvvyas90/RIOT,rousselk/RIOT,rfswarm/RIOT,AnonMall/RIOT,syin2/RIOT,d00616/RIOT,jhollister/RIOT,adrianghc/RIOT,Hyungsin/RIOT-OS,adrianghc/RIOT,neumodisch/RIOT,basilfx/RIOT,daniel-k/RIOT,jferreir/RIOT,rfswarm/RIOT,attdona/RIOT,miri64/RIOT,arvindpdmn/RIOT,latsku/RIOT,beurdouche/RIOT,roberthartung/RIOT,AnonMall/RIOT,thomaseichinger/RIOT,asanka-code/RIOT,abp719/RIOT,changbiao/RIOT,rfswarm2/RIOT,RBartz/RIOT,ximus/RIOT,beurdouche/RIOT,EmuxEvans/RIOT,locicontrols/RIOT,abkam07/RIOT,tfar/RIOT,PSHIVANI/Riot-Code,jferreir/RIOT,plushvoxel/RIOT,alignan/RIOT,JensErdmann/RIOT,thiagohd/RIOT,DipSwitch/RIOT,thiagohd/RIOT,stevenj/RIOT,watr-li/RIOT,herrfz/RIOT,tfar/RIOT,RBartz/RIOT,robixnai/RIOT,marcosalm/RIOT,immesys/RiSyn,RubikonAlpha/RIOT,avmelnikoff/RIOT,marcosalm/RIOT,sumanpanchal/RIOT,basilfx/RIOT,rfuentess/RIOT,jhollister/RIOT,immesys/RiSyn,bartfaizoltan/RIOT,gautric/RIOT,mfrey/RIOT,d00616/RIOT,ks156/RIOT,basilfx/RIOT,wentaoshang/RIOT,changbiao/RIOT,kaleb-himes/RIOT,l3nko/RIOT,kerneltask/RIOT,avmelnikoff/RIOT,luciotorre/RIOT,jremmert-phytec-iot/RIOT,ant9000/RIOT,dkm/RIOT,dkm/RIOT,DipSwitch/RIOT,MohmadAyman/RIOT,AnonMall/RIOT,roberthartung/RIOT,lebrush/RIOT,brettswann/RIOT,yogo1212/RIOT,AnonMall/RIOT,msolters/RIOT,locicontrols/RIOT,aeneby/RIOT,malosek/RIOT,abkam07/RIOT,yogo1212/RIOT,Lexandro92/RIOT-CoAP,locicontrols/RIOT,gautric/RIOT,thomaseichinger/RIOT,chris-wood/RIOT,brettswann/RIOT,arvindpdmn/RIOT,herrfz/RIOT-old,phiros/RIOT,sgso/RIOT,syin2/RIOT,fnack/RIOT,TobiasFredersdorf/RIOT,mtausig/RIOT,automote/RIOT,alex1818/RIOT,attdona/RIOT,jbeyerstedt/RIOT-OTA-update,Lexandro92/RIOT-CoAP,tfar/RIOT,neumodisch/RIOT,kaspar030/RIOT,adjih/RIOT,emmanuelsearch/RIOT,openkosmosorg/RIOT,kaleb-himes/RIOT,MarkXYang/RIOT,MarkXYang/RIOT,l3nko/RIOT,automote/RIOT,PSHIVANI/Riot-Code,haoyangyu/RIOT,rajma996/RIOT,gebart/RIOT,marcosalm/RIOT,adjih/RIOT,rakendrathapa/RIOT,arvindpdmn/RIOT,jhollister/RIOT,attdona/RIOT,automote/RIOT,PSHIVANI/Riot-Code,miri64/RIOT,smlng/RIOT,RubikonAlpha/RIOT,lazytech-org/RIOT,rajma996/RIOT,gbarnett/RIOT,latsku/RIOT,ThanhVic/RIOT,ntrtrung/RIOT,DipSwitch/RIOT,malosek/RIOT,rfuentess/RIOT,LudwigKnuepfer/RIOT,ximus/RIOT,kYc0o/RIOT,authmillenon/RIOT,JensErdmann/RIOT,mfrey/RIOT,fnack/RIOT,EmuxEvans/RIOT,ks156/RIOT,nsol-nmsu/RIOT,OlegHahm/RIOT,koenning/RIOT,marcosalm/RIOT,RBartz/RIOT,emmanuelsearch/RIOT,wentaoshang/RIOT,fnack/RIOT,shady33/RIOT,yogo1212/RIOT,1blankz7/RIOT,basilfx/RIOT,RubikonAlpha/RIOT,gebart/RIOT,tfar/RIOT,MonsterCode8000/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,FrancescoErmini/RIOT,mziegert/RIOT,OTAkeys/RIOT,Hyungsin/RIOT-OS,bartfaizoltan/RIOT,MarkXYang/RIOT,Osblouf/RIOT,Darredevil/RIOT,neiljay/RIOT,altairpearl/RIOT,watr-li/RIOT,jferreir/RIOT,PSHIVANI/Riot-Code,plushvoxel/RIOT,BytesGalore/RIOT,watr-li/RIOT,syin2/RIOT,MohmadAyman/RIOT,daniel-k/RIOT,OlegHahm/RIOT,TobiasFredersdorf/RIOT,thomaseichinger/RIOT,luciotorre/RIOT,phiros/RIOT,Osblouf/RIOT,cladmi/RIOT,herrfz/RIOT-old,TobiasFredersdorf/RIOT,Ell-i/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,arvindpdmn/RIOT,josephnoir/RIOT,koenning/RIOT,herrfz/RIOT-old,cladmi/RIOT,RIOT-OS/RIOT,kb2ma/RIOT,Josar/RIOT,rousselk/RIOT,benoit-canet/RIOT,adrianghc/RIOT,rajma996/RIOT,chris-wood/RIOT,phiros/RIOT,LudwigOrtmann/RIOT,kYc0o/RIOT,kaleb-himes/RIOT,gbarnett/RIOT,lazytech-org/RIOT,kerneltask/RIOT,kaspar030/RIOT,MohmadAyman/RIOT,mtausig/RIOT,LudwigKnuepfer/RIOT,kerneltask/RIOT,biboc/RIOT,patkan/RIOT,mziegert/RIOT,Hyungsin/RIOT-OS,l3nko/RIOT,openkosmosorg/RIOT,jremmert-phytec-iot/RIOT,plushvoxel/RIOT,kaspar030/RIOT,changbiao/RIOT,Josar/RIOT,l3nko/RIOT,rakendrathapa/RIOT,dailab/RIOT,luciotorre/RIOT,katezilla/RIOT,koenning/RIOT,neumodisch/RIOT,aeneby/RIOT,abkam07/RIOT,zhuoshuguo/RIOT,centurysys/RIOT,shady33/RIOT,dhruvvyas90/RIOT,shady33/RIOT,dhruvvyas90/RIOT,rfswarm2/RIOT,neiljay/RIOT,mziegert/RIOT,asanka-code/RIOT,dailab/RIOT,alex1818/RIOT,gautric/RIOT,bartfaizoltan/RIOT,mziegert/RIOT,haoyangyu/RIOT,tdautc19841202/RIOT,OlegHahm/RIOT,thomaseichinger/RIOT,khhhh/RIOT,dhruvvyas90/RIOT,Darredevil/RIOT,Ell-i/RIOT,abp719/RIOT,OlegHahm/RIOT,ntrtrung/RIOT,stevenj/RIOT,MonsterCode8000/RIOT,locicontrols/RIOT,nsol-nmsu/RIOT,LudwigKnuepfer/RIOT,RIOT-OS/RIOT,tdautc19841202/RIOT,rajma996/RIOT,thomaseichinger/RIOT,robixnai/RIOT,Osblouf/RIOT,abkam07/RIOT,Osblouf/RIOT,A-Paul/RIOT,Josar/RIOT,josephnoir/RIOT,attdona/RIOT,altairpearl/RIOT,zhuoshuguo/RIOT,beurdouche/RIOT,malosek/RIOT,rfswarm/RIOT,rfswarm2/RIOT,authmillenon/RIOT,alex1818/RIOT,dkm/RIOT,adjih/RIOT,yogo1212/RIOT,rakendrathapa/RIOT,x3ro/RIOT,herrfz/RIOT,gautric/RIOT,authmillenon/RIOT,Hyungsin/RIOT-OS,hamilton-mote/RIOT-OS,jferreir/RIOT,aeneby/RIOT,jasonatran/RIOT,binarylemon/RIOT,benoit-canet/RIOT,koenning/RIOT,OTAkeys/RIOT,Ell-i/RIOT,kerneltask/RIOT,koenning/RIOT,bartfaizoltan/RIOT,backenklee/RIOT,alignan/RIOT,dkm/RIOT,binarylemon/RIOT,nsol-nmsu/RIOT,altairpearl/RIOT,jremmert-phytec-iot/RIOT,watr-li/RIOT,rfuentess/RIOT,x3ro/RIOT,RIOT-OS/RIOT,abkam07/RIOT,biboc/RIOT,openkosmosorg/RIOT,Yonezawa-T2/RIOT,RubikonAlpha/RIOT,thiagohd/RIOT,asanka-code/RIOT,nsol-nmsu/RIOT,stevenj/RIOT,luciotorre/RIOT,authmillenon/RIOT,Ell-i/RIOT,miri64/RIOT,katezilla/RIOT,MohmadAyman/RIOT,Lexandro92/RIOT-CoAP,wentaoshang/RIOT,toonst/RIOT,marcosalm/RIOT,luciotorre/RIOT,1blankz7/RIOT,watr-li/RIOT,lazytech-org/RIOT,kaspar030/RIOT,hamilton-mote/RIOT-OS,MonsterCode8000/RIOT,avmelnikoff/RIOT,robixnai/RIOT,rousselk/RIOT,FrancescoErmini/RIOT,kYc0o/RIOT,Yonezawa-T2/RIOT,wentaoshang/RIOT,josephnoir/RIOT,EmuxEvans/RIOT,altairpearl/RIOT,authmillenon/RIOT,rfuentess/RIOT,JensErdmann/RIOT,benoit-canet/RIOT,sumanpanchal/RIOT,ThanhVic/RIOT,RBartz/RIOT,smlng/RIOT,malosek/RIOT,adjih/RIOT,stevenj/RIOT,attdona/RIOT,kbumsik/RIOT,jbeyerstedt/RIOT-OTA-update,rfswarm/RIOT,backenklee/RIOT,ximus/RIOT,dailab/RIOT,attdona/RIOT,A-Paul/RIOT,chris-wood/RIOT,kaleb-himes/RIOT,rakendrathapa/RIOT,kushalsingh007/RIOT,chris-wood/RIOT,stevenj/RIOT,gautric/RIOT,neumodisch/RIOT,gbarnett/RIOT,mtausig/RIOT,OTAkeys/RIOT,d00616/RIOT,kbumsik/RIOT,immesys/RiSyn,automote/RIOT,openkosmosorg/RIOT,EmuxEvans/RIOT,mtausig/RIOT,bartfaizoltan/RIOT,ximus/RIOT,AnonMall/RIOT,centurysys/RIOT,rfuentess/RIOT,Hyungsin/RIOT-OS,zhuoshuguo/RIOT,JensErdmann/RIOT,plushvoxel/RIOT,benoit-canet/RIOT,chris-wood/RIOT,jremmert-phytec-iot/RIOT,LudwigKnuepfer/RIOT,msolters/RIOT,adrianghc/RIOT,locicontrols/RIOT,MonsterCode8000/RIOT,rfswarm2/RIOT,BytesGalore/RIOT,wentaoshang/RIOT,latsku/RIOT,arvindpdmn/RIOT,centurysys/RIOT,Darredevil/RIOT,jferreir/RIOT,asanka-code/RIOT,RIOT-OS/RIOT,phiros/RIOT,ks156/RIOT,kYc0o/RIOT,jasonatran/RIOT,abp719/RIOT,herrfz/RIOT,altairpearl/RIOT,DipSwitch/RIOT,MohmadAyman/RIOT,roberthartung/RIOT,ntrtrung/RIOT,daniel-k/RIOT,d00616/RIOT,sumanpanchal/RIOT,asanka-code/RIOT,stevenj/RIOT,immesys/RiSyn,herrfz/RIOT,phiros/RIOT,sumanpanchal/RIOT,lebrush/RIOT,syin2/RIOT,khhhh/RIOT,josephnoir/RIOT,backenklee/RIOT,dhruvvyas90/RIOT,plushvoxel/RIOT,Osblouf/RIOT,toonst/RIOT,sgso/RIOT,ks156/RIOT,alex1818/RIOT,alignan/RIOT,patkan/RIOT,Yonezawa-T2/RIOT,OTAkeys/RIOT,ximus/RIOT,lazytech-org/RIOT,jferreir/RIOT,latsku/RIOT,tdautc19841202/RIOT,cladmi/RIOT