By Howard Schneider WASHINGTON (Reuters) -After a drop in job vacancies, a dip in rental costs and signs of growing consumer caution seemed to show the Federal Reserve’s strict monetary medicine beginning to kick in, a strong September jobs report has left policymakers still waiting for clear signs their efforts to cool the economy are working. The Labor Department’s report, which showed a gain of more than a quarter of a million jobs, a drop in the unemployment rate, and continued strong wage growth, points to a job market U.S. central bank officials will continue to see as out of line with d…