repository: introduce some common errors variables
repository: introduce some common errors variables

For detecting that users, keys and repositories don't exist across all
the code.

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