Add from_iterator creation flag

Author: thecjharries

pygit2/config.py

@@ -291,9 +291,10 @@ class ConfigEntry(object):
     """
 
     @classmethod
-    def _from_c(cls, ptr):
+    def _from_c(cls, ptr, from_iterator=False):
         entry = cls.__new__(cls)
         entry._entry = ptr
+        entry.from_iterator = from_iterator
         return entry
 
     def __del__(self):