fix deadlock in video review playback
fix deadlock in video review playback

Using the same lcm instance in two different python threads was causing
a deadlock. Not sure why this wasn't an issue before.  Perhaps we changed
LCM versions.

gizatt/director,empireryan/director,manuelli/director,gizatt/director,RobotLocomotion/director,gizatt/director,mithrandir123/director,rdeits/director,gizatt/director,openhumanoids/director,patmarion/director,RussTedrake/director,edowson/director,manuelli/director,openhumanoids/director,rdeits/director,mitdrc/director,empireryan/director,manuelli/director,manuelli/director,openhumanoids/director,mithrandir123/director,RobotLocomotion/director,patmarion/director,mitdrc/director,edowson/director,empireryan/director,openhumanoids/director,RobotLocomotion/director,edowson/director,mithrandir123/director,RussTedrake/director,RussTedrake/director,rdeits/director,mithrandir123/director,RussTedrake/director,mitdrc/director,edowson/director,openhumanoids/director,RobotLocomotion/director,patmarion/director,patmarion/director,RussTedrake/director,mitdrc/director,mitdrc/director,rdeits/director,rdeits/director,gizatt/director,patmarion/director,empireryan/director,edowson/director,mithrandir123/director,RobotLocomotion/director,empireryan/director,manuelli/director