Switch periodic commit enum value

it's "on" now instead of "true". Also added some smoke tests
Accidentally deleted test content, fixing that
print out expected error if there were errors
Still throw the error if there was one
Removed redundant nondeterministic test

This test is entirely covered by the LoaderTests, and it is
non deterministic depending on how long it takes to check the
constraints, so I'm removing it.
Use IMMEDIATE constraint check time by default

yay deterministic tests
Added a test with delayed constraint check time
merge ScottDugas: Dump commit auto with new enum values & Test determinism

Merge pull request #87 from ScottDugas/sql-layer-client-tools/dump-commit-auto
https://github.com/FoundationDB/sql-layer-client-tools/pull/87