v0.5.0

Additions

• validation: add tests when prestart/poststart/poststop hooks fail (#569).
• validate_test: add TestCheckMandatoryFields (#554).
• validation: add lifecycle validation (#558).
• validation: add 'state' test; using WaitingForStatus in insideValidation (#562).
• Relax LGTM requirement (#559, #566).
• validation: Fixes #556 (#557).

Minor fixes and documentaion

• validate_test: Complement test (#568).
• man: Modify the legal value of the rootfs-propagation (#548).
• generate: don't overwrite hook which has a same path (#571).
• validation: nil config support in lifecycle validate (#567).
• runtimetest: cmd/runtimetest/main: Run validateDefaultDevices even with process unset (#553).
• validation: Remove runc 'create' exit timing crutches (#563).
• validation/util/container: Use ExitError for stderr (#564).