Per Forlin authored Nov 30, 2018 and Sebastian Dröge committed Dec 07, 2018

gst_rtsp_connection_send() adds the Authorization header to the request.
If this function is being called multiple times with the same request
it will add one more Authorization header every time.

To fix to this issue do not append a new Authorization header on
top of an existing ones. Remove any existing Authorization headers first
and then add the new one.

Fixes gst-plugins-good#425