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Add a possibility to mount sources as volumes to containers, in "more than documentation" way. That will let us to use kolla as a replacement for devstack. Co-Authored-By: ZhijunWei <wzj334965317@outlook.com> Partially implements: blueprint mount-sources Change-Id: I7db7d7f0d13a4a17d1884f2cb6fa6f2c37cb0e2b