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This patch adds support to run watcher-api with mod-wsgi. It provides 1. wsgi app script files, to run watcher-api under apache. 2. updated devstack plugin to run watcher-api default with mod-wsgi. 3. Document to deploy watcher-api behind wsgi. Change-Id: I8f1026f0b09fd774376220c2d117ee66f72421b8 Closes-Bug: #1675376