Use runTestSuite interface to launch tests that request instance on
actual SlapOS cloud, using certificate passed as parameter.

Parameters are:
{
  'client.crt': <crt>,
  'client.key': <key>
  'master-url': <url>
}

Such a json of parameters can be generated from existing SlapOS client
configuration using the `generate_parameters` script.

The test currently requests a KVM and examines the connection dict as
a demo.