Revert "."

This reverts commit a2f192cb. This has
been merged upstream with nexedi/neoppod@17af7f27.
We should rather cherry-pick upstream commit.

neo/lib/app.py

@@ -72,7 +72,6 @@ class BaseApplication(object):
                     " provided: the CA certificate, and the certificate"
                     " of this node with its private key.")
             ca, cert, key = ssl
-            self.ssl_credentials = ssl # remember ca/cert/key, so that zstor_2zurl could retrive them
             import ssl
             version, version_name = max((getattr(ssl, k), k)
                 for k in dir(ssl) if k.startswith("PROTOCOL_TLSv"))