Created by: tgummerer
Summary: Currently the adb server is restarted both when there is no device attached, or when there is more than one device attached, but the user hasn't enabled multi install mode. Restarting the adb server helps when adb is flaky and shows devices as offline or not attached, but it doesn't help when there are too many devices are attached and the user forgets to enable multi install mode. This is usually a user error.
Disable the server restart and save a little time for the user.
Test plan: Test buck install with different device configurations and show it does the right thing about restarting the adb server.