Support md5 of message body

[OpenStack Infra]

https://review.openstack.org/539403
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/zaqar" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit a8215f72f960aeb22f3e3e30abf79b74617def4f
Author: yangzhenyu <email address hidden>
Date: Tue Jan 16 11:15:34 2018 +0800

    Support md5 of message body

    DocImpact
    ApiImpact

    Tempest plugin
    Depends-on: Icb82042afb1759f129f09e55c2961f1802ae83b4

    Implement blueprint support-md5-of-body

    Change-Id: I671737f423248ddc79bde74e492fc6d4c172bcd0

[wangxiyuan (wangxiyuan)]

https://review.openstack.org/#/c/534108/