Oleg Grenrus authored Apr 13, 2019 and David Feuer committed Apr 16, 2019

- Move the lib into `containers`
- Move the tests and benchmarks into `containers-tests`
- Make some adjustments so -Whome-modules is happy
- `ln -s` stuff from `containers` to `containers-tests`
  so things work; use containers-tests to be the library under test and
  benchmarking