Fix stale server.* imports in tests/storage/test_s3.py #75

Job	Run time
prepare	5s
build (api, ./docker/Dockerfile.api, public.ecr.aws/r4g1k2s3/vcon-dev/vcon-server-api, linux/arm6...	1m 32s
build (api, ./docker/Dockerfile.api, public.ecr.aws/r4g1k2s3/vcon-dev/vcon-server-api, linux/amd6...	48s
build (conserver, ./docker/Dockerfile.conserver, public.ecr.aws/r4g1k2s3/vcon-dev/vcon-server-con...	1m 30s
build (conserver, ./docker/Dockerfile.conserver, public.ecr.aws/r4g1k2s3/vcon-dev/vcon-server-con...	2m 28s
merge (api, public.ecr.aws/r4g1k2s3/vcon-dev/vcon-server-api)	13s
merge (conserver, public.ecr.aws/r4g1k2s3/vcon-dev/vcon-server-conserver)	16s
release	-1s
	6m 51s

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