Replace subnet_info module with osc command
Replace subnet_info module with osc command

This would help us to move to latest openstacksdk
in TripleO. We can revert this once AOC has been
fixed[1] for openstacksdk>=0.99.

[1] https://review.opendev.org/c/openstack/ansible-collections-openstack/+/857041

Change-Id: I337453a116e2a57154a619d300d0f052d6110bbd

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates