Add hand_swap_config #99

Job	Run time
build (svalboard/trackball/pmw3360, vial, right) / build	1m 44s
build (svalboard/trackball/pmw3389, vial, right) / build	2m 5s
build (svalboard/trackball/pmw3360, vial, left) / build	1m 45s
build (svalboard/trackball/pmw3389, vial, left) / build	1m 43s
build (svalboard/trackpoint, vial, right) / build	2m 16s
build (svalboard/trackpoint, vial, left) / build	1m 55s
build (svalboard, vial, left) / build	1m 41s
build (svalboard, vial, right) / build	1m 41s
	14m 50s

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