Merge branch '7.0' into 7.1

* 7.0:
  replace wurstmeister Docker images for Kafka and Zookeeper
  [PasswordHasher] Make bcrypt nul byte hash test tolerant to PHP related failures
  [HttpClient] Revert fixing curl default options
  [VarExporter] fix proxy helper when a method returns null
  [Validator] Update Dutch (nl) translation
  Fix exception thrown during `LDAP_MODIFY_BATCH_REMOVE_ALL` batch operations
  Fix various warnings across components test suite

Author: xabbuh

Tests/Config/ContainerParametersResourceCheckerTest.php

@@ -39,7 +39,7 @@ public function testSupports()
      */
     public function testIsFresh(callable $mockContainer, $expected)
     {
-        $mockContainer($this->container);
+        $mockContainer($this->container, $this);
 
         $this->assertSame($expected, $this->resourceChecker->isFresh($this->resource, time()));
     }