Description of enhancement:

Enhance "heketi-cli topology load" to:
1) display additional information about cause of errors parsing configuration file
2) Add option to allow a "dry run" of the "topology load"

Version-Release number of selected component (if applicable):

cns 3.6

Additional info:

Currently, https://github.com/heketi/heketi/blob/master/client/cli/go/cmds/topology.go line 116 merely displays "Unable to parse config file"

If the "err" variable is also displayed, the end-user would have more information to diagnose the cause.

In my case, jsonlint validated the file.  However, the underlying message was:
json: cannot unmarshal object into Go struct field ConfigFileNode.devices of type string

Having the message along with the dry run option would allow rapid isolation of the cause of the error.