Installation toolkit setup fails with an ssh-agent related error

The installation toolkit setup might fail with an ssh-agent related error.

The error message is similar to the following:

ERROR: Net::SSH::Authentication::AgentError: could not get identity count

Workaround:

Issue the following command on each node added in the installation toolkit cluster definition.
```
eval "$(ssh-agent)";
```
Retry the installation procedure by using the installation toolkit.