provision/docker: add retry on pull
provision/docker: add retry on pull

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