scheduler_daemon tests: remove fake model classes
scheduler_daemon tests: remove fake model classes

Change-Id: I6f634ba4312f7e48d8140fa9973f49dd05e1e9cc

OSSystems/lava-server,Linaro/lava-server,OSSystems/lava-server,OSSystems/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server