server_test.go: Use context.Background() instead of TODO in tests.
server_test.go: Use context.Background() instead of TODO in tests.

Suggected in: https://golang.org/pkg/context/#Background

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