fix vttablet uncaught panic on commit
Merge branch 'master' into liguo
Remove false warnings in vttablet
Refactor Tablet's fields.
Merge branch 'master' of github.com:youtube/vitess
Merge branch 'master' into replication

Conflicts:
	go/vt/tabletmanager/actor.go
	go/vt/wrangler/reparent_external.go