BUCHAREST, March 20 (Reuters) - France's Renault , which owns Romanian carmaker Dacia, will sign a deal with the country's centrist government to build a 500 million-euro ($664 million) research centre, a senior official said on Tuesday. The centre, which will employ around 3,000 people, will be set up in the town of Titu, in the southern Dambovita county, and will design and develop future Renault car models.