Merge branch 'lslocks--per-process' of https://github.com/masatake/util-linux

Merge branch 'lslocks--per-process' of https://github.com/masatake/util-linux

* 'lslocks--per-process' of https://github.com/masatake/util-linux:
  lslocks: (man) update the note about OFDLCK
  lslocks: (test) add a case for OFDLCK type locks
  lslocks: use information extracted from "locks: " column of /proc/$pid/fdinfo/*
  lslocks: (refactor) lift up the code destroying the lock list for future extension
  lslocks: rename functions for future extension
  lslocks: refactor the code reading /proc/locks
  lslocks: (refactor) remove 'pid' global variable
  lslocks: (man) document LEASE type
  lslocks: (test) add a case