rpmbuild: git module name to define lookaside url
    
    Dist-git historically maps the "module" name to the lookaside url, not
    the spec file name.  Due to historical coincidence, it may pretty much
    easily happen that we have foo.spec in baz.git module.  Though we store
    the files under /baz/ namespace on DistGit, so we should try to search
    there instead in /foo/..
    
    Caught by the beaker test:
    copr-cli build-package --name test_package_scm ...