Merge branch '4.3' into 4.4

* 4.3:
  [DoctrineBridge] [DX] Improve condition for exception text in ManagerRegistry to avoid confusion
  Fix testing with mongodb
  Minor Travis cosmetic patch
  [Cache] fix checking for igbinary availability
  bumped Symfony version to 4.3.11
  updated VERSION for 4.3.10
  updated CHANGELOG for 4.3.10
  bumped Symfony version to 3.4.38
  updated VERSION for 3.4.37
  update CONTRIBUTORS for 3.4.37
  updated CHANGELOG for 3.4.37

Author: nicolas-grekas

ManagerRegistry.php

@@ -13,6 +13,7 @@
 
 use Doctrine\Persistence\AbstractManagerRegistry;
 use ProxyManager\Proxy\LazyLoadingInterface;
+use Symfony\Bridge\ProxyManager\LazyProxy\Instantiator\RuntimeInstantiator;
 use Symfony\Component\DependencyInjection\Container;
 
 /**
@@ -50,7 +51,7 @@ protected function resetService($name)
         $manager = $this->container->get($name);
 
         if (!$manager instanceof LazyLoadingInterface) {
-            throw new \LogicException('Resetting a non-lazy manager service is not supported. '.(interface_exists(LazyLoadingInterface::class) ? sprintf('Declare the "%s" service as lazy.', $name) : 'Try running "composer require symfony/proxy-manager-bridge".'));
+            throw new \LogicException('Resetting a non-lazy manager service is not supported. '.(interface_exists(LazyLoadingInterface::class) && class_exists(RuntimeInstantiator::class) ? sprintf('Declare the "%s" service as lazy.', $name) : 'Try running "composer require symfony/proxy-manager-bridge".'));
         }
         $manager->setProxyInitializer(\Closure::bind(
             function (&$wrappedInstance, LazyLoadingInterface $manager) use ($name) {