CB-18046 Introduce a command runner for Cloudbreak API Test project to multiple SSH

[aszegedi]

Currently we have integrated SSHJClient to connect VMs and execute commands there. Instead of connect to VMs multiple times during test executions, we can use a simple combined command runner for checking results in one round.

Basically we should be able:

• execute commands on VMs remotely, like we do in case of diagnostics
  • on SDX, Distrox, FreeIpa and their instances and hostrgroups
• then get the results (for example in JSON format):
  • need to parse the JSON result