(Refiling to reflect change of company name from Smith Travel Research Inc to STR in paragraph 6) By Doyinsola Oladipo (Reuters) -With more U.S. travelers expected to take to the skies and the roads this summer as COVID restrictions ease, unbridled demand will strain capacity in the leisure and travel industry and push prices even higher. Airlines, hotels, rental car companies and booking sites all reported a surge in demand for their services in the latest batch of company earnings. But at the same time, many of those companies face a tight labor market and limited volume as they scramble to …