Remove example of deprecated app.info
Remove example of deprecated app.info

Using the app instance for logging is deprecated. Thus updates example
output to show using a logger instead.

Change-Id: I060dbb528d303a00bc4b4b91a0816e35b561e07b
Signed-off-by: Sean McGinnis <961eeb09b6d45516665e15b82e013282c4faf575@gmail.com>

openstack/openstackdocstheme,openstack/openstackdocstheme,openstack/openstackdocstheme,openstack/openstackdocstheme