pbr is removing support for wsgi_script due to changes in setuptools.
Use the wsgi script module python code instead.
Note that this change only touches CentOS code. Ubuntu and Debian will
be updated later when we bump the release used in our testing.
Change-Id: Ie3a0740a69733728a254e20bd8029f04bc4106ab
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
9fe12a5c2a