Added testMultipleRecognize in FileCarRecognizerTest

Signed-off-by: Ondrej Skopek <skopekondrej@gmail.com>
Renamed imagePath to imagePath1 for better readability

in CarSorterImplTest and FileCarRecognizerTest.

Signed-off-by: Ondrej Skopek <skopekondrej@gmail.com>
Stopped FileCarRecognizerTest from polluting tmp dir

Signed-off-by: Ondrej Skopek <skopekondrej@gmail.com>