provision/docker/provisioner_test: fixing data race
provision/docker/provisioner_test: fixing data race

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