添加资源栈模板(AddStackTemplate)

用户可以使用AddStackTemplate添加资源栈模板。 例如：

AddStackTemplate name=userdata 
templateContent="{  \"ZStackTemplateFormatVersion\" : \"2018-06-18\",  \"Description\": \"Example for create a group vm instance in zstack.\",
  \"Parameters\" : {    \"imageUuid\": {      \"Type\" : \"String\",      \"Description\": \"Image Uuid,
 represents the image resource to startup one vm instance\ntest enter\"    },    \"instanceOfferingUuid\":
 {      \"Type\": \"String\",      \"Description\": \"The instance offering uuid\"    },    \"l3NetworkUuid\": {      \"Type\": \"String\",      
\"Description\": \"The l3 network uuid\"    }  },  \"Resources\" : {    \"WebServer1\": {      \"Type\": \"ZStack::Resource::VmInstance\",      
\"Properties\": {        \"name\" : \"vm\",        \"description\": \"test\\nenter\",        \"imageUuid\" : {\"Ref\": \"imageUuid\"},        
\"instanceOfferingUuid\":  {\"Ref\": \"instanceOfferingUuid\"},        \"l3NetworkUuids\": [{\"Ref\": \"l3NetworkUuid\"}],        
\"systemTags\": [\"userdata::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\"]      }    }  },  
\"Outputs\": {    \"VmInstance\": {      \"Description\" : \"print vm instance\",      \"Value\" : {\"Ref\": \"WebServer1\"}    }  }}"