provision/docker: remove image only once
provision/docker: remove image only once

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