Fix config parser warning
Fix config parser warning

/usr/lib/python3.6/site-packages/tripleo_common/actions/ansible.py:154:
DeprecationWarning: This method will be removed in future versions.  Use
'parser.read_file()' instead.
  config.readfp(sio_cfg)

Change-Id: Ibd33a26feae03e4f0d46370346b7a950d1f6b02c

openstack/tripleo-common,openstack/tripleo-common