There have been several times recently when operators had trouble relocking the squeezer after it unlocks and takes us out of observing, which seemed to be solved by re-requesting different states from the squeezer guardian. 

The reason the squeezer knocks us out of observing is because the SHG PZT hits it's rail, this seems to be happening ~once or twice a day. 

The reason the squeezer wasn't relocking is because the beam diverter wasn't re-opening after the squeezer relocked.  The problem was that the beam diverter won't respond to multiple requests to move that happen too soon after each other, and in some places the guardian was making the requests to rapidly.  

Daniel added a channel for the beam diverter called "busy" which can be checked before making a request of the beam diverter.  This problem should be avoided with changes to the SQZ_MANAGER for the time being, but in the future we can have a busy check for the beam diverter.