misc/circus: declare GORACE environment variable for collector and web
misc/circus: declare GORACE environment variable for collector and web

This is how I found #276, and we will find other data races in execution
environment.

Endika/tsuru,RichardKnop/tsuru,4eek/tsuru,kgrvamsi/tsuru,tsuru/tsuru,RichardKnop/tsuru,Endika/tsuru,cezarsa/tsuru,gciotta/tsuru,ArxdSilva/tsuru,hugoantunes/tsuru,4eek/tsuru,ggarnier/tsuru,guilhermebr/tsuru,mderaldo/tsuru,kgrvamsi/tsuru,cgvarela/tsuru,jblancett/tsuru,tsuru/tsuru,gciotta/tsuru,firebitsbr/tsuru,jblancett/tsuru,mderaldo/tsuru,cezarsa/tsuru,cezarsa/tsuru,tsuru/tsuru,jblancett/tsuru,guilhermebr/tsuru,tuxmonteiro/tsuru,gciotta/tsuru,cgvarela/tsuru,guilhermebr/tsuru,cezarsa/tsuru,tuxmonteiro/tsuru,cgvarela/tsuru,tsuru/tsuru,Endika/tsuru,hcxiong/tsuru,firebitsbr/tsuru,ggarnier/tsuru,ggarnier/tsuru,mderaldo/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,gwmoura/tsuru,ArxdSilva/tsuru,hugoantunes/tsuru,4eek/tsuru,gwmoura/tsuru,firebitsbr/tsuru,kgrvamsi/tsuru,gwmoura/tsuru,tuxmonteiro/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,hcxiong/tsuru,hcxiong/tsuru,RichardKnop/tsuru