Joined Cases C-266/17 and C 267/17: Judgment of the Court (Fourth Chamber) of 21 March 2019 (requests for a preliminary ruling from the Oberlandesgericht Düsseldorf — Germany) — Rhein-Sieg-Kreis (C-266/17), Rhenus Veniro GmbH & Co. KG (C-267/17) v Verkehrsbetrieb Hüttebräucker GmbH, BVR Busverkehr Rheinland GmbH (C-266/17), Kreis Heinsberg (C-267/17) (Reference for a preliminary ruling — Transport — Public passenger transport services by rail and by road — Regulation (EC) No 1370/2007 — Article 5(1) and (2) — Direct award — Contracts for public passenger transport services by bus and tram — Conditions — Directive 2004/17/EC — Directive 2004/18/EC)