travis: simplify build
travis: simplify build

We always install hg and bzr via apt-get, no need to check it again.

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