Helper for retrying statements
Use helper in test cleanup
Use helper in test init
Use helper in DumpClient
Clean schema in before and helper in other tests
Naming consistency
Simple usage in DumpLoader
merge nathanlws: Retry loop helper

Merge pull request #56 from nathanlws/sql-layer-client-tools/dump-stale-statements
https://github.com/FoundationDB/sql-layer-client-tools/pull/56