Merge branch 'utmpdump' of git://github.com/kerolasa/lelux-utiliteetit

* 'utmpdump' of git://github.com/kerolasa/lelux-utiliteetit:
  docs: add file format note to utmpdump manual page
  tests: utmpdump add subsecond accuracy test
  tests: challenge utmpdump localization go-around
  tests: fix utmpdump timestamps to be in iso format
  utmpdump: use iso-8601 timestamp format with subsecond accuracy
  libcommon: add ISO_8601_GMTIME that will print UTC-0 timestamps
  utmpdump: use always UTC-0 timezone in textual output