rbd: add ReadIterate implementing rbd_read_iterate2#624

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phlogistonjohn wants to merge 3 commits intoceph:masterfrom phlogistonjohn:jjm-read-iterate2

+182-10

Commits on Dec 20, 2021

rbd: update doc comments for rbd image Read and Write funcs
phlogistonjohn
committed

Commits on Dec 21, 2021