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

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

* 'feat/add_columns_env_ls_cmds' of https://github.com/cgoesche/util-linux-fork:
  lscpu: (man) document the LSCPU_{CACHES_}COLUMNS environment variables
  bash-completion: (lscpu) add -H/--list-columns options
  lscpu: add --list-columns option and declutter --help output
  lscpu: add support for LSCPU_{CACHES_}COLUMNS environment variables
  lsclocks: add support for LSCLOCKS_COLUMNS environmental variable
  tests: (lsmem) update expected/lscpu/* with 'ZONES' column
  lsmem: add support for LSMEM_COLUMNS environmental variable