Use container-interop exception interfaces

src/Exception/ExceptionInterface.php

@@ -9,6 +9,8 @@
 
 namespace Zend\ServiceManager\Exception;
 
-interface ExceptionInterface
+use Interop\Container\Exception\ContainerException;
+
+interface ExceptionInterface extends ContainerException
 {
 }

src/Exception/ServiceNotFoundException.php

@@ -9,6 +9,9 @@
 
 namespace Zend\ServiceManager\Exception;
 
-class ServiceNotFoundException extends InvalidArgumentException
+use Interop\Container\Exception\NotFoundException;
+
+class ServiceNotFoundException extends InvalidArgumentException implements
+    NotFoundException
 {
 }