gateway: allow configuration of the home path #189

Job	Run time
go	1s
integration	1s
docker (docker/Dockerfile.revad-eos) / docker	1s
docker (docker/Dockerfile.revad) / docker	1s
docker (docker/Dockerfile.reva) / docker	1s
docker (docker/Dockerfile.revad-ceph) / docker	1s
docker (docker/Dockerfile.revad-eos) / docker	1s
acceptance-1	0s
acceptance-2	0s
litmus	0s
	7s

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