fix go vet errors

Signed-off-by: Jess Frazelle <jessfraz@google.com>

fix composites

Signed-off-by: Jess Frazelle <me@jessfraz.com>

pkg/util/proxy/dial.go

@@ -69,9 +69,9 @@ func DialURL(url *url.URL, transport http.RoundTripper) (net.Conn, error) {
 					inferredHost = host
 				}
 				// Make a copy to avoid polluting the provided config
-				tlsConfigCopy := *tlsConfig
+				tlsConfigCopy, _ := utilnet.TLSClientConfig(transport)
 				tlsConfigCopy.ServerName = inferredHost
-				tlsConfig = &tlsConfigCopy
+				tlsConfig = tlsConfigCopy
 			}
 			tlsConn = tls.Client(netConn, tlsConfig)
 			if err := tlsConn.Handshake(); err != nil {