(Updates with Kerry comments) By Warren Strobel and Suleiman Al-Khalidi AMMAN, **v 13 (Reuters) - Israel and the Palestinians have pledged to take concrete steps to calm tensions around Jerusalem's holiest site, U.S. Secretary of State John Kerry said on Thursday after talks in the Jordanian capital. Violence has flared in recent weeks over the compound, revered by Muslims as **ble Sanctuary, where al-Aqsa mosque stands, and by Jews as the Temple Mount, where their biblical temples once stood. ...