Correct spacing in helpers commands for -e and -k options
Pass the endpoint to the bulk import tool

Changes:
* read the Config.endpoint method to retrieve
  the endpoint, which contains the following
  info in this priority:
  * TD_API_SERVER envirnment variable
  * -e / --endpoint command line option value
  * endpoint saved in the configuration
    file, if present
* set the td.api.server.scheme system property
  for the bulk import tool to avoid SSL
  communication misconfigurations
* set the 'ssl' flag correctly for the bulk
  import tool settings
* Completed work for CLT-213