Add "tsd.storage.hbase.tree_table" config parameter
Add tree table variable, check and getter to TSDB
Modify all tree related code to use the new tree table instead of forcing
multiple rows of data in the UID table. This will improve scan performance
across TSUIDs
Add tsdb-tree to the create_table.sh script
Add "store_failures" option to trees so that we can avoid writing potentially
massively wide rows unless the user explicitly wants to. Collisions and not
matched rows will still be logged.