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Add the property ``checksum`` for message schema. Implement blueprint support-md5-of-body Change-Id: Icb82042afb1759f129f09e55c2961f1802ae83b4
Add the property ``checksum`` for message schema. Implement blueprint support-md5-of-body Change-Id: Icb82042afb1759f129f09e55c2961f1802ae83b4