By Sharon Bernstein LOS ANGELES (Reuters) - A federal judge has rebuffed California Governor Jerry Brown's effort to undo a court order requiring the state to reduce its prison population, saying he did not trust officials to improve conditions for inmates. Brown, a Democrat, is under political pressure to scale back a program under which state prisoners are sent to local jurisdictions to ease crowding. That move has led to the early release of thousands of non-violent offenders from lower-level county jails as municipalities struggle to make room for them. ...