Release 0.4.0

The biggest feature in this release is the support for joining
existing user and pid namespaces. This doesn't work in the setuid
mode (at the moment).

Other changes:
  - Stores namespace info in status json
  - In setuid mode pid 1 is now marked dumpable
  - Now builds with musl libc

Alexander Larsson (17):
      Tests: Fix test count
      setuid mode: Properly drop privs in monitor and pid1
      Mark init process as dumpable so we can see stuff in its /proc
      Add support for --userns and --userns2
      tests: test --userns
      utils: Add some utility function to pass pids over a socket
      utils: Add fork_intermediate_child() helper
      Add support for --pidns
      Add tests for --pidns
      tests: Better error message if assert_files_equal fails
      Fix typo in comment
      Drop cap bounding set also in --userns case
      Allow --uid and --gid with --userns
      tests: Fix --userns tests
      --userns --uid: Only swtich user if needed
      Merge pull request #338 from containers/reuse-namespaces
      Bump 0.4.0

Christian Kellner (3):
      bwrap: set opt_unshare_cgroup when _try succeeds
      bwrap: include the pid namespace id in status/json
      tests: check namespace info in json

Colin Walters (1):
      Post-release version bump

Jonathan Lebon (1):
      ci: Bump to fedora/29/atomic

shawrkbait (1):
      Add work-around for TEMP_FAILURE_RETRY to support musl

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