//  https://golang.org/src/crypto/tls/generate_cert.go
//    $ go run generate_cert.go -ca --host 127.0.0.1
// The generated certificate contains IP SAN, that way we don't need
// to enable InsecureSkipVerify in TLS config

// Starts the test server and returns the TestServer with TLS configured instance.
func StartTestTLSServer(t TestErrHandler, instanceType string, cert, key []byte) TestServer {