Adding the vertical split clone job. init() only works now.
Checkpoint for WIP on worker-based clone.
Moving the connection pool functionnality out of tabletserver.

Now used by tabletserver yet, need review first.
go fmt these files.
Format some go files
Merge branch 'master' of https://github.com/youtube/vitess
Now using the new dbconnpool in tabletserver.
Using a connection pool for vt_dba connections in mysqlctl.
Merge branch 'master' into replication
Merge commit '047ffc2c84af0367207a003f1e99c285bce38650'
Merge branch 'master' into replication
Adding an RPC to execute dba command remotely. Good thing
the vtaction commands are protected.
VTTablet: On shutdown stop streaming queries

Stop fetching more batches if tablet is shutting down
VTTablet: Terminate individual streaming queries
Serving from unit socket deletes the file if exists
Merge branch 'master' of github.com:youtube/vitess
Merge branch 'master' of https://github.com/youtube/vitess
Remove dependency on opts-go.
Merge branch 'zk-cleanup'
Use logutil.Flush() instead of log.Flush().