Update StreamingTaskMap
Fixing a threading issue in topo client code.
Update checkpoing api
Update checkpointing api
Add VTDATAROOT setting and creation to dev.env.
Fixing a corner case in cgzip decoder.

That was discovered with go 1.3. It is legal for a Reader
to return both data (n>0) and io.EOF. If the returned data
doesn't fit in one output buffer, we'd hit this corner case.
Fix scatter query with first ShardConn result being empty
Adding comments to the code.
More verbosity in logs for mysqlctl.

This is what I did for debugging yesterday.
Refactoring this test code so we can use it in other parts.
using variables instead of hardcoded values.
moving files around to avoid unnecessary dependencies.
Fixing package name.
Support for running python integration tests from Java.

Test is broken and is intended to be fixed in a later release.