repositories: Some systems only have gpgv2
repositories: Some systems only have gpgv2

fixes #837

laurent-george/weboob,Boussadia/weboob,laurent-george/weboob,nojhan/weboob-devel,willprice/weboob,Konubinix/weboob,franek/weboob,yannrouillard/weboob,laurent-george/weboob,frankrousseau/weboob,sputnick-dev/weboob,Konubinix/weboob,willprice/weboob,nojhan/weboob-devel,frankrousseau/weboob,RouxRC/weboob,yannrouillard/weboob,Konubinix/weboob,frankrousseau/weboob,eirmag/weboob,Boussadia/weboob,RouxRC/weboob,RouxRC/weboob,eirmag/weboob,yannrouillard/weboob,franek/weboob,sputnick-dev/weboob,eirmag/weboob,franek/weboob,Boussadia/weboob,sputnick-dev/weboob,willprice/weboob,nojhan/weboob-devel,Boussadia/weboob