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Provide support for kolla dev mode in mistral. When 'kolla_dev_mode' or 'mistral_dev_mode' variables are enabled, source code of mistral project is cloned and bind mounted. Partially implements: blueprint mount-sources Co-Authored-By: chenqiaomin <chen.qiaomin@99cloud.net> Change-Id: I6e5f9b1a6b35dbb672905987e715cae4bf10af7f