Fix the nil panic because of am.AccessManagementInterface

[LinuxSuRen]

fix #9

surenpi/ks-devops-plugin-apiserver:latest

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[JohnNiang]

I've built this ks-devops-plugin as docker image and applied it to my environment. But there is still an error as below:

Full log of ks-devops-plugin:

 W0804 03:14:08.776084       1 client_config.go:552] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.

 W0804 03:14:08.778156       1 options.go:107] ks-apiserver starts without redis provided, it will use in memory cache. This may cause inconsistencies when running ks-apiserver with multiple replicas.

 I0804 03:14:08.811598       1 apiserver.go:196] Start cache objects

 I0804 03:14:09.431530       1 apiserver.go:315] Finished caching objects

 I0804 03:14:09.431580       1 apiserver.go:150] Start listening on :9090

 &{test  [system:authenticated] map[]} my-workspace &{0xc0009b7e50 creationTimestamp false map[] }

 E0804 03:15:17.430487       1 devops.go:86] resource is not supported

 E0804 03:15:17.430547       1 utils.go:76] /workspace/pkg/kapis/tenant/v1alpha2/handler.go:71 resource is not supported

 I0804 03:15:17.430732       1 apiserver.go:352] 10.233.66.119 - "GET /kapis/tenant.kubesphere.io/v1alpha2/workspaces/my-workspace/devops?limit=10 HTTP/1.1" 500 26 0ms

 &{test  [system:authenticated] map[]} my-workspace &{0xc000dc9cc0 creationTimestamp false map[] }

 E0804 03:15:18.553306       1 devops.go:86] resource is not supported

 E0804 03:15:18.553329       1 utils.go:76] /workspace/pkg/kapis/tenant/v1alpha2/handler.go:71 resource is not supported

 I0804 03:15:18.553473       1 apiserver.go:352] 10.233.66.119 - "GET /kapis/tenant.kubesphere.io/v1alpha2/workspaces/my-workspace/devops?limit=10 HTTP/1.1" 500 26 0ms

 &{test  [system:authenticated] map[]} my-workspace &{0xc0004123f0 creationTimestamp false map[] }

 E0804 03:15:22.992938       1 devops.go:86] resource is not supported

 E0804 03:15:22.993085       1 utils.go:76] /workspace/pkg/kapis/tenant/v1alpha2/handler.go:71 resource is not supported

 I0804 03:15:22.993228       1 apiserver.go:352] 10.233.66.119 - "GET /kapis/tenant.kubesphere.io/v1alpha2/workspaces/my-workspace/devops?limit=10 HTTP/1.1" 500 26 1ms

 E0804 03:15:24.129815       1 devops.go:86] resource is not supported

 E0804 03:15:24.129848       1 utils.go:76] /workspace/pkg/kapis/tenant/v1alpha2/handler.go:71 resource is not supported

 I0804 03:15:24.129882       1 apiserver.go:352] 10.233.66.119 - "GET /kapis/tenant.kubesphere.io/v1alpha2/workspaces/my-workspace/devops?limit=10 HTTP/1.1" 500 26 0ms

 &{test  [system:authenticated] map[]} my-workspace &{0xc000494170 creationTimestamp false map[] }

@LinuxSuRen , please take a look at it.

[JohnNiang]

If I missed anything, please feel free to correct me or provide some steps to test.