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

Adapter/ExtLdap/UpdateOperation.php

@@ -48,10 +48,15 @@ public function __construct(int $operationType, string $attribute, ?array $value
 
     public function toArray(): array
     {
-        return [
+        $op = [
             'attrib' => $this->attribute,
             'modtype' => $this->operationType,
-            'values' => $this->values,
         ];
+
+        if (\LDAP_MODIFY_BATCH_REMOVE_ALL !== $this->operationType) {
+            $op['values'] = $this->values;
+        }
+
+        return $op;
     }
 }

Tests/Adapter/ExtLdap/LdapManagerTest.php

@@ -265,6 +265,23 @@ public function testLdapAddAttributeValuesError()
         $entryManager->addAttributeValues($entry, 'mail', $entry->getAttribute('mail'));
     }
 
+    public function testLdapApplyOperationsRemoveAll()
+    {
+        $entryManager = $this->adapter->getEntryManager();
+
+        $result = $this->executeSearchQuery(1);
+        $entry = $result[0];
+
+        $entryManager->applyOperations($entry->getDn(), [new UpdateOperation(\LDAP_MODIFY_BATCH_REMOVE_ALL, 'mail', null)]);
+
+        $result = $this->executeSearchQuery(1);
+        $entry = $result[0];
+
+        $this->assertNull($entry->getAttribute('mail'));
+
+        $entryManager->addAttributeValues($entry, 'mail', ['fabpot@symfony.com', 'fabien@potencier.com']);
+    }
+
     public function testLdapApplyOperationsRemoveAllWithArrayError()
     {
         $entryManager = $this->adapter->getEntryManager();