travis: install device mapper
travis: install device mapper

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