Update vt/tabletserver for GTID refactor.
Update vt/tabletserver for GTID refactor.

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oby/vitess,xgwubin/vitess,yangzhongj/vitess,ptomasroos/vitess,sougou/vitess,skyportsystems/vitess,tjyang/vitess,applift/vitess,kmiku7/vitess-annotated,kmiku7/vitess-annotated,mlc0202/vitess,dcadevil/vitess,mlc0202/vitess,kmiku7/vitess-annotated,mapbased/vitess,nurblieh/vitess,ptomasroos/vitess,ptomasroos/vitess,tinyspeck/vitess,HubSpot/vitess,michael-berlin/vitess,vitessio/vitess,yaoshengzhe/vitess,enisoc/vitess,atyenoria/vitess,dumbunny/vitess,applift/vitess,skyportsystems/vitess,dumbunny/vitess,rnavarro/vitess,mahak/vitess,tjyang/vitess,tjyang/vitess,ngaut/vitess,atyenoria/vitess,atyenoria/vitess,alainjobart/vitess,davygeek/vitess,tirsen/vitess