Test drive encoder safety

[LizzyMilford]

Test how well the safety for the drive encoders works in the DriveTrainSystem class. Note if it fails the left encoder too often or not often enough using fake values. Can work with "Make fancy shuffleboard" issue in FRC_2018 for printing what you need on the dashboard if they are not done when you need it. See @LizzyMilford for more info

https://github.com/LibertyRobotics/frc-2018-summer-project/blob/f12acbd7b7458fe5226e327ea215c1af036cb51f/src/org/usfirst/frc/falcons6443/robot/subsystems/DriveTrainSystem.java#L92-L125

[LizzyMilford]

NOTE: you may need to bother electrical about getting a second encoder on the drivetrain if it is not done by the time you start this issue