Edge-home-orchestration-go: [DataStorage] 运行时错误

描述错误
edgex 代工厂服务器未运行时出现运行时错误，

level=ERROR ts=2021-01-19T01:51:50.815737266Z app=datastorage source=init.go:154 msg="Get \"http://localhost:48080/api/v1/ping\": dial tcp 127.0.0.1:48080: connect: connection refused"
level=INFO ts=2021-01-19T01:51:51.817181193Z app=datastorage source=init.go:144 msg="Check Metadata service's status by ping..."
level=INFO ts=2021-01-19T01:51:51.818287982Z app=datastorage source=init.go:144 msg="Check Data service's status by ping..."
level=ERROR ts=2021-01-19T01:51:51.822577012Z app=datastorage source=init.go:154 msg="Get \"http://localhost:48081/api/v1/ping\": dial tcp 127.0.0.1:48081: connect: connection refused"
level=ERROR ts=2021-01-19T01:51:51.824049381Z app=datastorage source=init.go:154 msg="Get \"http://localhost:48080/api/v1/ping\": dial tcp 127.0.0.1:48080: connect: connection refused"
level=INFO ts=2021-01-19T01:51:52.825768174Z app=datastorage source=init.go:144 msg="Check Metadata service's status by ping..."
level=INFO ts=2021-01-19T01:51:52.826907105Z app=datastorage source=init.go:144 msg="Check Data service's status by ping..."
level=ERROR ts=2021-01-19T01:51:52.830784824Z app=datastorage source=init.go:154 msg="Get \"http://localhost:48081/api/v1/ping\": dial tcp 127.0.0.1:48081: connect: connection refused"
level=ERROR ts=2021-01-19T01:51:52.83209855Z app=datastorage source=init.go:154 msg="Get \"http://localhost:48080/api/v1/ping\": dial tcp 127.0.0.1:48080: connect: connection refused"
INFO[2021-01-19T01:51:53Z]discovery.go:833 activeDiscovery [discoverymgr] activeDiscovery!!!
INFO[2021-01-19T01:51:53Z]discovery.go:571 func1 [deviceDetectionRoutine] edge-orchestration-3125da9e-1e9a-41aa-ac83-004725eb2d1e
level=ERROR ts=2021-01-19T01:51:53.83359109Z app=datastorage source=init.go:139 msg="dependency Metadata service checking time out"
level=ERROR ts=2021-01-19T01:51:53.834663766Z app=datastorage source=init.go:139 msg="dependency Data service checking time out"
level=INFO ts=2021-01-19T01:51:53.840074015Z app=datastorage source=httpserver.go:116 msg="Web server shutting down"
level=INFO ts=2021-01-19T01:51:53.841736032Z app=datastorage source=httpserver.go:107 msg="Web server stopped"
level=INFO ts=2021-01-19T01:51:54.341966491Z app=datastorage source=httpserver.go:118 msg="Web server shut down"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x8d1a0e]

goroutine 44 [running]:
github.com/edgexfoundry/device-sdk-go/internal/autoevent.(*manager).StopAutoEvents(0x0)
        /home/t25kim/edge-home-orchestration-go/vendor/github.com/edgexfoundry/device-sdk-go/internal/autoevent/manager.go:69 +0x4e
github.com/edgexfoundry/device-sdk-go/pkg/service.(*DeviceService).Stop(0xc0004c2780, 0xc0005ae600)
        /home/t25kim/edge-home-orchestration-go/vendor/github.com/edgexfoundry/device-sdk-go/pkg/service/service.go:134 +0x45
github.com/edgexfoundry/device-sdk-go/pkg/service.Main(0xe2dbda, 0xb, 0xe3a91d, 0x1a, 0xda46e0, 0xc0005a5de0, 0xf46e20, 0xc0005ae600, 0xc0000330a0, 0xc0005ac300, ...)
        /home/t25kim/edge-home-orchestration-go/vendor/github.com/edgexfoundry/device-sdk-go/pkg/service/main.go:69 +0x6fa
github.com/edgexfoundry/device-sdk-go/pkg/startup.Bootstrap(0xe2dbda, 0xb, 0xe3a91d, 0x1a, 0xda46e0, 0xc0005a5de0)
        /home/t25kim/edge-home-orchestration-go/vendor/github.com/edgexfoundry/device-sdk-go/pkg/startup/bootstrap.go:19 +0x117
created by github.com/lf-edge/edge-home-orchestration-go/src/controller/storagemgr.StorageImpl.StartStorage
        /home/t25kim/edge-home-orchestration-go/src/controller/storagemgr/storage.go:51 +0xef

再现

1. 将必要的配置文件放在 /var/edge-orchestration/datastorage/
2. 运行 edge-home-orchestration-go

预期行为
在启动 Data Storage 之前，请提前检查 edgex 代工厂服务器。

测试环境配置（请填写以下信息）：

• 固件版本：Ubuntu 18.04
• 硬件：x86-64
• Edge Orchestration 发布：Coconut