Move collation mode setting next to default charset, collation
Remove tests exercising treespaces
Replace treespaces with a single configured volume
Remove remaining test TreeService usages
Move SCHEMA_TREE_NAME to PSSM
Simplify and collapse TreeLink/TreeCache
Cleanup. Don't use deprecated methods.
FailureOnStartupIT uses service that is always valid instead of PersistitStore
Fully functioning Key
Schema is not relevant to getting a TreeLink
Redundant method
merge nathanlws: Lots of TreeService cleanup

Merge pull request #1064 from nathanlws/sql-layer/more-treeservice-cleanup
https://github.com/FoundationDB/sql-layer/pull/1064