collect stack details
collect stack details

So far we collect the stack details but this is not enough to
efficiently troubleshoot a problem.
With this change we will:
- list the nodes of the cluster
- connect from the undercloud to each nodes
- list the last os-collect-config errors.

By doing so, we should be able to spot clear error messages.

Change-Id: I1ec82dd5a433dded329b03557e4e136fe3b6d9ac

redhat-cip/python-dciclient,redhat-cip/python-dciclient