Clear the previous inventory during provisioning

If there was a left-over inventory from a previous run that had nodes
which were subsequently removed, these would still show up in the
Ansible's in-memory inventory and Ansible would fail trying to connect
to them.

This is because Ansible automatically loads the `inventory/hosts` file
if it exists and even if we overwrite it later, every node and group
still remains in the memory.

By removing the inventory file and and calling the `refresh_inventory`
meta task, we make sure that any left-over values are removed.

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