prune unused exceptions imports for Python 3

gnupg/_meta.py

@@ -26,7 +26,6 @@ from __future__ import absolute_import
 import atexit
 import codecs
 import encodings
-import exceptions
 ## For AOS, the locale module will need to point to a wrapper around the
 ## java.util.Locale class.
 ## See https://code.patternsinthevoid.net/?p=android-locale-hack.git

gnupg/_util.py

@@ -27,7 +27,6 @@ from time       import mktime
 
 import codecs
 import encodings
-import exceptions
 import os
 import psutil
 import threading

gnupg/gnupg.py

@@ -31,7 +31,6 @@ from __future__ import absolute_import
 from codecs     import open as open
 
 import encodings
-import exceptions
 import functools
 import os
 import re