Work around missing sslwrap in Python 2.7.9 (fixes #477)

gevent/_ssl2.py

@@ -80,15 +80,27 @@ class SSLSocket(socket):
             self._sslobj = None
         else:
             # yes, create the SSL object
-            if ciphers is None:
-                self._sslobj = _ssl.sslwrap(self._sock, server_side,
-                                            keyfile, certfile,
-                                            cert_reqs, ssl_version, ca_certs)
+            if hasattr(_ssl, 'sslwrap'):
+                if ciphers is None:
+                    self._sslobj = _ssl.sslwrap(self._sock, server_side,
+                                                keyfile, certfile,
+                                                cert_reqs, ssl_version, ca_certs)
+                else:
+                    self._sslobj = _ssl.sslwrap(self._sock, server_side,
+                                                keyfile, certfile,
+                                                cert_reqs, ssl_version, ca_certs,
+                                                ciphers)
             else:
-                self._sslobj = _ssl.sslwrap(self._sock, server_side,
-                                            keyfile, certfile,
-                                            cert_reqs, ssl_version, ca_certs,
-                                            ciphers)
+                self.context = __ssl__.SSLContext(ssl_version)
+                self.context.verify_mode = cert_reqs
+                if ca_certs:
+                    self.context.load_verify_locations(ca_certs)
+                if certfile:
+                    self.context.load_cert_chain(certfile, keyfile)
+                if ciphers:
+                    self.context.set_ciphers(ciphers)
+                self._sslobj = self.context._wrap_socket(self._sock, server_side=server_side, ssl_sock=self)
+
             if do_handshake_on_connect:
                 self.do_handshake()
         self.keyfile = keyfile