all: Refactor to non-global logger

Note that this looks like overkill for just the logger, and that is correct,
but this will make sense once we start with the template handling etc.

Updates #2701

hugolib/sitemap_test.go

@@ -46,6 +46,7 @@ func doTestSitemapOutput(t *testing.T, internal bool) {
 	viper.Set("baseURL", "http://auth/bub/")
 
 	s := &Site{
+		deps:     newDeps(DepsCfg{}),
 		Source:   &source.InMemorySource{ByteSource: weightedSources},
 		Language: helpers.NewDefaultLanguage(),
 	}