SSL: Fix sslConfiguration in encrypted slot

If "encrypted" signal is fired the configuration of ssl is not updated.
If someone wants to perform additional checks on the certificate chain
it is now possible to use peerCertificate and peerCertificateChain.

Change-Id: Id5136a8c52727562c36028eaef721cc9ad86619d
Task-number: QTBUG-40401
Reviewed-by: Richard J. Moore <rich@kde.org>