QSslSocket: Add accessors for SSL version

QSslSocket: Add accessors for SSL version

This commit adds accessors for both the openssl version number and the
version string. The intention here is to aid debugging by making it
possible for applications to know which version of the openssl library
has been found by the runtime linking code.

Since the version of openssl in use will depend on the installation of
the developer, the test cases merely display the version string and
number rather than verifying that any particular version is in use.

Change-Id: Ieec44f0941f99887c85c2858bab0481722d739e5
Merge-request: 12
Reviewed-by: Peter Hartmann <peter.hartmann@nokia.com>
Reviewed-on: http://codereview.qt.nokia.com/1406
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>