Merge branch 'lsfd-refine-columns' of https://github.com/masatake/util-linux

Merge branch 'lsfd-refine-columns' of https://github.com/masatake/util-linux

* 'lsfd-refine-columns' of https://github.com/masatake/util-linux:
  lsfd: cosmetic change
  lsfd: (man) write about PIDFD.* columns
  lsfd: show pid, comm, and nspid of pidfd in PIDFD.{PID,COMM,NSPID} columns
  lsfd: (filter): accept '.' used in column names
  tests: (lsfd) fix the potential problems reported by github-code-scan
  tests: (lsfd) put double quote characters around variable expansions
  lsfd: use NAME column to show cooked file names
  lsfd: use TYPE column to show cooked file types
  lsfd: show classes of anonyomous inodes in AINODECLASS column
  lsfd: cosmetic changes
  tests: (mkfds) add a factory for making an inotify fd
  tests: (mkfds) cosmetic change, deleting an empty line