provision/juju: update copyright header in stubs_test.go
provision/juju: update copyright header in stubs_test.go

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