Spelling.
URIs code doesn't break anything :)

Unfortunately we don't handle HDFS as yet.
Sketch of test framework.

There are quite a few options, to support different important use cases.
Changes accumulated during testing.
Shorten error message when CGroups are borked.

Looking for a dead container's memory usage very reasonable results in an
error.
Add more options to test runner.
Pass URIs.
Fix up exit codes and diagnostics.

Displays CGroups that were found (if any).
Changes for successful test run sans executor.

Was able to test daemon containers, URIs and simple sleeps.