Added cv::flip using Transparent API
Enable GStreamer 1.x support by default.

GStreamer 1.x is universally available, and with 0.10 being deprecated,
there should be no reason to default to 0.10 stil.
Fixed test for ocl_flip
Merge pull request #1936 from ElenaGvozdeva:ocl_flip
Merge pull request #1941 from vhdirk:gst1x_default
added cv::norm to T-API