Maint: package local narrow Logger interfaces

internal/shadowsocks/logger.go

@@ -0,0 +1,19 @@
+package shadowsocks
+
+type Logger interface {
+	debuger
+	infoer
+	errorer
+}
+
+type debuger interface {
+	Debug(s string)
+}
+
+type infoer interface {
+	Info(s string)
+}
+
+type errorer interface {
+	Error(s string)
+}