RDKCMF-6245 Secure Connection for image download
RDKCMF-6245 Secure Connection for image download

Reason for change: Secure comunication for image download using TLS 1.2.
                   If the server doesnt support TLS 1.2, then handshake is
                   completed using a lower protocol. If HTTPS fails, then finally
                   switched to HTTP mode. Errors are logged
Test Procedure: Verify deviceInitiated Firmware Upgrade
Risks: Low
Signed-off-by: gtheres <Geethu_TheresK@comcast.com>

Change-Id: I389e046630838f175f3da2fe0db02565f659e331

rdkcmf/rdk-sysint