Sacramento Metro Firefighters extinguished an early morning blaze before it reached several threatened homes.   Shortly after 12:00 a.m. Thursday morning, Sacramento Metropolitan Fire Department was called to a grass fire to rear of 3600 Glencrest Lane. When firefighters arrived, and were able to access the fire ground, it appeared that there were actually three fires. Several additional grass and structure engines were dispatched to protect the homes. When asked if this was indeed three separate fires and was this possibly arson, on scene arson investigators stated that it was under investigation. Battalion Chief, Frank Moreno (Bat 15), stressed that it is very important that reside