travis: more tweaks
travis: more tweaks

- Move back to the new infrastructure
- Do not add GOPATH/bin to the PATH, travis already does that
- Do not install bzr and git, travis already does that
- Remove the sudo calls (it didn't work)

guilhermebr/tsuru,cgvarela/tsuru,kgrvamsi/tsuru,cgvarela/tsuru,tsuru/tsuru,kgrvamsi/tsuru,Endika/tsuru,ggarnier/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,cgvarela/tsuru,gciotta/tsuru,hcxiong/tsuru,gciotta/tsuru,ggarnier/tsuru,tsuru/tsuru,guilhermebr/tsuru,gwmoura/tsuru,cezarsa/tsuru,kgrvamsi/tsuru,tuxmonteiro/tsuru,gwmoura/tsuru,tuxmonteiro/tsuru,gciotta/tsuru,cezarsa/tsuru,hcxiong/tsuru,tsuru/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,tuxmonteiro/tsuru,hcxiong/tsuru,ArxdSilva/tsuru,gwmoura/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,Endika/tsuru,cezarsa/tsuru,guilhermebr/tsuru,ggarnier/tsuru,Endika/tsuru,tsuru/tsuru