Change glance default back to WSGI mode

The situation around glance under WSGI has changed a lot in a week.
We can now run tasks and imports under WSGI, so let's switch the
default back so that glance is consistent (by default) with the
other projects.

Change-Id: I3ae285b2ac4972c0b8abaccfc7c0ede0e1c49bf1
1 file changed