.travis.yaml: Enables race in the tests
.travis.yaml: Enables race in the tests

As the TestV3WatchRestoreSnapshotUnsync flakiness was fixed, this
removes the TODO and enables the race again.

mkumatag/etcd,gyuho/etcd,etcd-io/etcd,etcd-io/etcd,rnaveiras/etcd,coreos/etcd,mqliang/etcd,gyuho/etcd,coreos/etcd,rnaveiras/etcd,rnaveiras/etcd,ajityagaty/etcd,mqliang/etcd,mkumatag/etcd,mkumatag/etcd,mqliang/etcd,etcd-io/etcd,ajityagaty/etcd,ajityagaty/etcd