test__socket_ssl.py: exit silently if there's not socket.ssl

greentest/test__socket_ssl.py

 #!/usr/bin/python
 from gevent import monkey; monkey.patch_all()
-
+import sys
 import unittest
 import httplib
 import socket
 
+if not hasattr(socket, 'ssl'):
+    sys.exit(0)
+
 class AmazonHTTPSTests(unittest.TestCase):
 
     def test_amazon_response(self):