git: don't use unqualified imports for gocheck
git: don't use unqualified imports for gocheck

Related to #330.

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