Fixing a mutex copy by using pointers.
The for loop in formatTableStatuses is actually copying
the object. Oops.

Govet found this in google3.
Merge branch 'master' into replication
Merge pull request #216 from youtube/replication

Replication
CopySchemaShard with a passing integration test
Get rid of timeout when using context with tmc
Run new vtworker tests by default.
Removing ShardExternallyReparented. We now use TabletExternallyReparented
on the new master. Updating unit test.
Now checking for at least 2 healthy rdonly instances in workers.
That way we don't consume the last rdonyl instance and possibly
cause an outage.
Removing schema creation from vtworkers
Small rename.
Merge pull request #211 from youtube/aaijazi_add_copy_shard_schema

CopySchemaShard with a passing integration test
Merge branch 'master' into replication
Merge branch 'master' into resharding
Fixing tablet names after Ammar's changes.
Merge pull request #221 from youtube/resharding

Now checking for at least 2 healthy rdonly instances in workers.
Merge branch 'master' into replication
Constrain that dml is targeted for one keyspace_id.
Fixing the test.
Merge pull request #219 from youtube/resharding-tests

Run new vtworker tests by default.
Merge pull request #220 from youtube/replication

Removing ShardExternallyReparented. We now use TabletExternallyReparente...