Refactor 'heketi_node_list' function

Do following improvements to this function:
- Remove support of python Heketi client, because it is dead code.
  It is dead code, because all of the tests which use this function,
  explicitly depend on the CLI output, not being compatible with it.
- Remove useless 'json' arg, as CLI client does not support it for 'node
  list' command.
- Parse list of node IDs in it, not delegating this to the consumer.
- Raise exception in case we failed to get list of nodes

And, of course, update all the places where this function is used.
Making those places use less code compared to previous variant.

Change-Id: I3f1ffe6082541e63dc3d638c19c54086aa12580f

0 files changed, 0 insertions, 0 deletions