* 'lsns--Q' of https://github.com/masatake/util-linux:
tests: (lsns) add a case testing -Q, --filter option
tests: (test_mkfds::userns) add a new factory
tests: (test_mkfds::multiplexing) fix the factory description
lsns: add -H, --list-columns option
lsns: implement -Q, --filter option
lsfd: (man) fix the decoration of an optional parameter
lsns: add a missing '=' character in the help message
lsns: (man) make the namespace parameter optional
lsblk: (refactor) refer to a parameter instead of a file static var