when ceilometer api is deployed in httpd, however
the process name is like '/usr/sbin/httpd -DFOREGROUND',
it is ambiguous and make monitoring more difficult.
the aodh, gnocchi module are also like that.
so we should set an appropriate name for wsgi process.
Change-Id: I5e8c9be062a88e9ed6442e6cbce6573fba385030
Related-Bug: #1626550