Make app.wsgi more like ironic.cmd.api
Make app.wsgi more like ironic.cmd.api

This changes app.wsgi to behave the same way as ironic.cmd.api
entrypoint. It adds configuration logging, and passes sys.argv to
prepare_service.

Change-Id: I8474311434eb07da8359eb25ad513d9c4e992a94
Closes-Bug: #1483306

NaohiroTamura/ironic,devananda/ironic,ionutbalutoiu/ironic,pshchelo/ironic,dims/ironic,ionutbalutoiu/ironic,bacaldwell/ironic,hpproliant/ironic,redhat-openstack/ironic,dims/ironic,openstack/ironic,bacaldwell/ironic,pshchelo/ironic,NaohiroTamura/ironic,openstack/ironic,Tan0/ironic,SauloAislan/ironic,naterh/ironic,SauloAislan/ironic