New versions of Retryable no longer monkey patch Kernel

https://github.com/nfedyashev/retryable/commit/9dc4579a6ae7054ae1495bacd103c36fb0dd7889
Update metadata.json hash

This is as generated by the latest 1.5.x release of chef-zero.
Merge pull request #296 from samcrang/fix-tests

Fix some failing tests