Merge branch 'statmount-mountinfo-parity' of https://github.com/ejc3/util-linux

* 'statmount-mountinfo-parity' of https://github.com/ejc3/util-linux:
  libmount: report superblock flags in listmount-based tables
  libmount: fetch superblock flags and mount options together
  libmount: report filesystem subtype in listmount-based tables
  libmount: do not let a failed statmount() leave a libmnt_fs half-filled