Improved the cursor creation api and changed vtgatev2 test to use cursor
api where possible.
Add tracing for GetTabletMap and FindAllTablets.
Remove unused vtgate client.
Merge branch 'master' into trace
Merge branch 'trace'
Merge pull request #202 from youtube/client_cleanup

Remove unused vtgate client.
Merge pull request #203 from youtube/vtclient

Improved the cursor creation api and changed vtgatev2 test to use cursor
Merge branch 'master' into replication