Buggified Yaml Tester

New Buggified Yaml tester which uses RandomCostModel to run all yaml
tests in order to achieve alternative plans to test correctness
new properties flag random-cost in order to suppress yaml tests which
contains operator plans
cleanup

cleanup
Order By Fix

added order by to query so it won’t fail with random cost model
Remove tricky, compat only parser settings from valid dynamic SET list
Restore DEFAULT at end of test
merge nathanlws: Remove parser settings from SET list

Merge pull request #1388 from nathanlws/sql-layer/no-unsafe-parser-dynamic-set
https://github.com/FoundationDB/sql-layer/pull/1388
One seed per yaml file

Now only one seed is used per yaml file,
now called PostgresServerRandomCostYamlDT
now depends upon PostgresServerMiscYamlIT to avoid unnecessary code
Got rid  of isSpecifiedSeed

added newline before output, noticed it not printing on next line in
some cases
remove isSpecifiedSeed
yaml fix

removed change that caused PostgresSeverMiscYamlIT to fail
merge JerettS: Buggified Yaml Tester

Merge pull request #1387 from JerettS/sql-layer/BuggifiedYaml
https://github.com/FoundationDB/sql-layer/pull/1387