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

* 'refactor_chcpu' of https://github.com/cgoesche/util-linux-fork:
  tests: (chcpu) test partial success chcpu code
  tests: (chcpu) adjust expected output files
  chcpu: remove unsused system headers
  chcpu: improve error handling in cpu_set_dispatch() and cpu_rescan()
  chcpu: make usage() output translator friendly
  chcpu: handle ul_path_readf_s32() errors
  chcpu: fix persistent partial success exit code
  chcpu: minor code fixes
  chcpu: re-enable warning message if last CPU is being disabled
  chcpu: refactor to introduce context struct