provision/docker: use GetCommands to avoid data race
provision/docker: use GetCommands to avoid data race

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