Fixes pubsub push subscription sample (GoogleCloudPlatform#969)

Author: bshaffer

pubsub/api/src/create_push_subscription.php

@@ -42,7 +42,7 @@ function create_push_subscription($projectId, $topicName, $subscriptionName, $en
     $topic = $pubsub->topic($topicName);
     $subscription = $topic->subscription($subscriptionName);
     $subscription->create([
-        'endpoint' => $endpoint
+        'pushConfig' => ['pushEndpoint' => $endpoint]
     ]);
 
     printf('Subscription created: %s' . PHP_EOL, $subscription->name());

pubsub/api/test/pubsubTest.php

@@ -209,10 +209,11 @@ public function testCreateAndDeletePushSubscription()
     {
         $topic = $this->requireEnv('GOOGLE_PUBSUB_TOPIC');
         $subscription = 'test-subscription-' . rand();
+        $fakeUrl = sprintf('https://%s.appspot.com/receive_message', self::$projectId);
         $output = $this->runCommand('subscription', [
             'subscription' => $subscription,
             '--topic' => $topic,
-            '--endpoint' => 'https://example.com/receive_message',
+            '--endpoint' => $fakeUrl,
             '--create' => true,
             'project' => self::$projectId,
         ]);