Add block/disk IO functionality#18

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csssuf wants to merge 7 commits intomasterfrom

Commits on Aug 4, 2017

guid: derive PartialEq and Eq
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Commits on Aug 7, 2017

bootservices: add locate_device_path
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Commits on Aug 8, 2017

Commits on Aug 9, 2017

base,bootservices: implement allocate_pages
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Commits on Jan 19, 2018

protocol: implement block and disk IO protocols
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