By Phil Stewart WASHINGTON (Reuters) - The Threat from Islamic State fighters to the Syrian Kurdish town of Kobani is an early test of the U.S.-led coalition's patience for a military strategy that at the moment can**t hold ground in Syria. As President Barack Obama met with top brass at the Pentagon on Wednesday, his administration sought to set low expectations for what U.S.-led air strikes could accomplish in Syria's ground war, and ack**wledged Kobani may fall into the clutch of Islamic State, also k**wn as ISIL, in the days ahead. ...