This make it easier for user to understand the difference between
the two concepts and avoids confusion.
Change-Id: Ib42913722c93a1e7e3c8b156173c458230946592
Conflicts:
validate/tools/gst-validate-transcoding.c
validate/tools/gst-validate.c
For instance, "fakesrc" will return a fakesrc, not a pipeline.
This is similar to what gst-launch does, and avoids calling
pipeline API on a non pipeline object (and thus asserting).
Makes the result a bit more readable than a compact multi-line list.
FIXME: Figure out how to print the description of the issues (which can
spawn multiple lines) in a nice way.