Merge branch 'feat/add_json_opt_lslogins' of https://github.com/cgoesche/util-linux...

Merge branch 'feat/add_json_opt_lslogins' of https://github.com/cgoesche/util-linux-fork

* 'feat/add_json_opt_lslogins' of https://github.com/cgoesche/util-linux-fork:
  bash-completion: (lslogins) add --list-columns option
  lslogins: (man) add --list-columns description
  lslogins: add -H and --list-columns option; declutter --help output
  lslogins: (man) add --json information
  bash-completion: (lslogins) add --json completion
  tests: (lslogins) test --json output mode
  lslogins: add JSON output format mode