Correct vmware ssh power manager

{_NodeName_} in list_running has to be replaced since the power manager
relies on it.

Now _get_hosts_name_for_node is called before list_running, so unit
tests are modified too.

Change-Id: I4a787039b7bc0f13c29455f041120e9e43e7c46b
Closes-Bug: #1400674
Merge "Correct vmware ssh power manager"