Merge branch 'lsfd--handle-newline-in-unix-socket-path' of https://github.com/masatak...

Merge branch 'lsfd--handle-newline-in-unix-socket-path' of https://github.com/masatake/util-linux

* 'lsfd--handle-newline-in-unix-socket-path' of https://github.com/masatake/util-linux:
  lsfd: (test) add a case for testing a unix socket including newline characters in its path name
  lsfd: re-fill unix socket paths with sockdiag netlink interface
  lsfd: add comment listing functions names importing via #include
  lsfd: include common headers in lsfd.h
  lsfd: include system header files first
  lsfd: fix a misleading parameter name
  lsfd: add const modifier