Convert actual output into a list of lists

and add it to the exception
Have it throw a ComparisonFailure

great for intellij, not so much for command line
Use new package name
merge ScottDugas: Better yamlTester errors

Merge pull request #1407 from ScottDugas/sql-layer/better-yaml-errors
https://github.com/FoundationDB/sql-layer/pull/1407