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Adds handling of running ironic API under Apache as WSGI app to devstack plugin. New variable IRONIC_USE_MOD_WSGI (False by default) is added. Another new variable IRONIC_WSGI_DIR (default is distro specific) is also added, which specifies location for WSGI scripts. Change-Id: I9c5ad56e1acd292ff0f9cc9b460125fc420abda5 Closes-Bug: #1513005