Jenne, Nutsinee

IFO_LOCK guardian now manages SQZ_LOCK_L1 which is a manager to all other squeezer guardians. It will take SQZ system (except for TTFSS and SHG) to DOWN and close the pump flipper to preserve the fiber. In 'LOWNOISE_LENGTH_CONTROL' IFO_LOCK guardian will take squeezer to a ready state and wait there until 'INJECT_SQUEEZING'. At this state the guardian will determine if squeezer is good to go. If True, it will open the beam diverter and lock the LO loop. If False, it will give user a message and move on without trying anything (for now, until we really really need squeezer to be on all the time).