CEE MARKETS-Currencies ease, Poland seen retaining loose monetary policy

* Rouble, lira woes moderately weigh on forint, zloty * Polish cbank seen reiterating: rates could stay low for years * Polish long-term yields lowest since autumn 2016 By Sandor Peto BUDAPEST, April 11 (Reuters) - The zloty and the forint eased on Wednesday as a fall of the rouble and the Turkish lira caused currency selling in emerging markets, while investors expected a dovish message from the Polish central bank's (NBP) rate-setting meeting. Assets in Central Europe,