provision/docker/bs: improve help messages for bs commands
provision/docker/bs: improve help messages for bs commands

ggarnier/tsuru,cezarsa/tsuru,cezarsa/tsuru,tsuru/tsuru,guilhermebr/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,tsuru/tsuru,ArxdSilva/tsuru,tsuru/tsuru,cezarsa/tsuru,ggarnier/tsuru,guilhermebr/tsuru,tsuru/tsuru,ggarnier/tsuru,gwmoura/tsuru,ArxdSilva/tsuru,ggarnier/tsuru,gwmoura/tsuru,guilhermebr/tsuru,gwmoura/tsuru,ArxdSilva/tsuru,guilhermebr/tsuru