uri: Add test for correct absolute URI handling in gst_uri_from_string_with_base()
uri: Add test for correct absolute URI handling in gst_uri_from_string_with_base()

If the second parameter is an absolute URI, the base should have no effect and
the second parameter should be returned again.

https://bugzilla.gnome.org/show_bug.cgi?id=755134

centricular/gstreamer,jpxiong/gstreamer,centricular/gstreamer,jpxiong/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,centricular/gstreamer