Re-enable GLOBAL_VENV

... because it is required to migrate the job to Noble. Note that
deployment of aodh-api will be switched to uwsgi by this change,
because mod_wsgi does not work with GLOBAL_VENV and uwsgi is now more
widely used in devstack deployment.

Change-Id: I8740c2abab6474b7786ea99d222e6f972e7f8095
1 file changed