PYTHON-2799 Use namespace returned from initial command response for killCursors (#666)

(cherry picked from commit 8675dc0)

Author: prashantmital

pymongo/command_cursor.py

@@ -75,7 +75,7 @@ def __die(self, synchronous=False):
         if self.__id and not already_killed:
             cursor_id = self.__id
             address = _CursorAddress(
-                self.__address, self.__collection.full_name)
+                self.__address, self.__ns)
         else:
             # Skip killCursors.
             cursor_id = 0

pymongo/cursor.py

@@ -350,7 +350,7 @@ def __die(self, synchronous=False):
         if self.__id and not already_killed:
             cursor_id = self.__id
             address = _CursorAddress(
-                self.__address, self.__collection.full_name)
+                self.__address, "%s.%s" % (self.__dbname, self.__collname))
         else:
             # Skip killCursors.
             cursor_id = 0