GenericBuilder: Add a boolean 'succeeded' parameter to finalize

Previously MockModuleBuilder was checking the module state to see if
it should run a final createrepo, but since eafa93037f, finalize() is
called before changing the module state; add an explicit boolean to
GenericBuilder.finalize() to avoid worrying about ordering.

module_build_service/builder/base.py

@@ -262,12 +262,13 @@ class GenericBuilder(six.with_metaclass(ABCMeta)):
         raise NotImplementedError()
 
     @abstractmethod
-    def finalize(self):
+    def finalize(self, succeeded=True):
         """
+        :param succeeded: True if all module builds were successful
         :return: None
 
         This method is supposed to be called after all module builds are
-        successfully finished.
+        finished.
 
         It could be utilized for various purposes such as cleaning or
         running additional build-system based operations on top of