Merge branch 'revise--test-cases' of https://github.com/masatake/util-linux

* 'revise--test-cases' of https://github.com/masatake/util-linux:
  tests: (lsfd::mkfds_vsock) skip if diag socket for AF_VSOCK is unavailable
  tests: (test_mkfds::sockdiag) support AF_VSOCK family
  tests: (lsns::filter) skip if /proc/self/uid_map is not writable