The Infosys logo is seen at the SIBOS banking and financial conference in Toronto, Ontario, Canada October 19, 2017. REUTERS/Chris HelgrenCHENNAI, Aug 22 (Reuters) – India’s Finance Minister Nirmala Sitharaman has summoned Infosys Ltd (INFY.NS) Chief Executive Salil Parekh to explain tech glitches in an online tax portal developed by…