Switch back to built-in md5 method

The md5 wrapper from oslo.utils[1] was deprecated because
the usedforsecurity argument should be available in all python
versions currently supported.

[1] https://review.opendev.org/c/openstack/oslo.utils/+/930879

Change-Id: Ibff3287a06b42be92288ae15454e4920158d43fc
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
5 files changed