support erasure code for ceph rbd

Registered by weibin on 2019-09-10

The API of Ceph RBD of `copy()`, `create()`, `clone()` and `rbd import` have been supported erasure code since Kraken (v11.1.0) [1], but glance_store, nova and cinder does not support this feature. I think we should implement this feature too.

[1] https://github.com/ceph/ceph/pull/11353

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weibin
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Addressed by: https://review.opendev.org/681187
    Add support for using ceph RBD ereasure code

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