Separate glance and eventlet wsgi logging

The log output from both glance.common.wsgi and
eventlet.wsgi have the same prefix:

glance.wsgi.server [-] Started child 3679
glance.wsgi.server [-] (3679) wsgi starting up on http://0.0.0.0:80/

It's better to have them separated, eg:

glance.common.wsgi [-] Started child 3729
eventlet.wsgi.server [-] (3729) wsgi starting up on http://0.0.0.0:80/

(This matches, for example, the Cinder behaviour.)

Change-Id: Ic42a2966e63270a6a9fed4eeb3b7737ca25b8c1d
Closes-bug: #1382585
Merge "Separate glance and eventlet wsgi logging"