Make RBD Image Upload Asynchronous

Registered by norman shen on 2020-08-05

Currently, uploading image through rbd store is serial, meaning that each write operation has to wait until previous operation completed. This does not perform well even if a 10G network is used. To speed up image upload process, use aio_write and allow
concurrent writing.

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Drafter:
norman shen
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Assignee:
norman shen
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New
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