The GstQaRunner is now a simple aggregator of reports that it receives
from monitors and filechecker. This allows it to be used in both
scenarios without APIs that expect GstElement or Monitors, that are
only used on the pipeline monitoring QA tests.
Adds a property that triggers the file playback tests on
GstQaFileCheker. Also enable it in the gst-transcoding post file checks.
The implementation is simple, just create a playbin2 and use fakesinks
as sinks, set it to playing and wait for either EOS or ERROR messages.
It is an object that is capable to run a few file checks. The
implemented tests are: file size, duration, if the file is seekable and
comparing the file stream types with a encoding profile
