Mini-cluster (mclu) rewritten to use ansible

As (kind of) requested in several comments on the previous post I’ve rewritten mclu so it uses Ansible for most communications. (diff)

Since Ansible handles communicating with ssh servers in parallel, it’s a bit faster and in theory a bit more scalable.

Update

Another advantage is that you can run regular ansible commands, for example:

ansible cluster -u root -a "yum -y update"

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