use istio client-go library instead of knative (#1661)

use istio client-go library instead of knative
bump kubernetes dependency version
change code coverage to codecov

vendor/sigs.k8s.io/testing_frameworks/integration/internal/etcd.go

@@ -1,6 +1,8 @@
 package internal
 
-import "net/url"
+import (
+	"net/url"
+)
 
 var EtcdDefaultArgs = []string{
 	"--listen-peer-urls=http://localhost:0",
@@ -28,9 +30,9 @@ func isSecureScheme(scheme string) bool {
 func GetEtcdStartMessage(listenUrl url.URL) string {
 	if isSecureScheme(listenUrl.Scheme) {
 		// https://github.com/coreos/etcd/blob/a7f1fbe00ec216fcb3a1919397a103b41dca8413/embed/serve.go#L167
-		return "serving client requests on " + listenUrl.Hostname()
+		return "serving client requests on "
 	}
 
 	// https://github.com/coreos/etcd/blob/a7f1fbe00ec216fcb3a1919397a103b41dca8413/embed/serve.go#L124
-	return "serving insecure client requests on " + listenUrl.Hostname()
+	return "serving insecure client requests on "
 }