Update python-dracclient version
Update python-dracclient version

Update python-dracclient version to indicate Yoga compatibility with
8.*.* releases.

Version 8.0.0 is available from PyPI [1].

[1] https://pypi.org/project/python-dracclient/8.0.0/

Change-Id: I07aa527cf13a8af63e12133508fdfd94d6aaf197

openstack/ironic,openstack/ironic