checking for existing container is unreliable when the storage account has more than 5000 containers

The default list result for list_containers is limited to 5000 containers. This causes the container check to become unreliable when using this plugin with a storage account with more than 5000 containers.

See azure API for details: https://docs.microsoft.com/en-us/rest/api/storageservices/list-containers2#uri-parameters