feat: export corosync configuration

[tomjelinek]

Enhancement: Provide ha_cluster_info module to export current cluster configuration. This PR implements a first stage, exporting corosync configuration. Other parts of configuration will follow in other PRs.

Reason: This is the first step in implementing an info module which exports cluster configuration in a variables structure in the same format as ha_cluster role accepts.

Result: ha_cluster_info module exports corosync configuration, which can be used to recreate the same corosync cluster when passed to the role

Issue Tracker Tickets (Jira or BZ if any): https://issues.redhat.com/browse/RHEL-46219