Add internal/client/route_list{,_test}.go

Co-authored-by: Héctor Hurtado <hector.hurtado@bbva.com>

internal/client/route_list.go

@@ -0,0 +1,13 @@
+package client
+
+import (
+	"io"
+
+	"github.com/BBVA/kapow/internal/http"
+)
+
+// ListRoutes list the routes registered on the kapow! instance
+func ListRoutes(host string, w io.Writer) error {
+	url := host + "/routes/"
+	return http.Get(url, "application/json", nil, w)
+}