ctf: Fix simple resource leak warnings

ctf: Fix simple resource leak warnings

Many warnings left though. For instance, the Stream/StreamInput/
StreamInputReader etc. constructor should create their inner Closeable
objects themselves (instead of having to pass say
new StreamInput(new StreamInputReader(...)) ). That way they can keep
a reference to it, and close() it in their own close() method.

Right now nobody keeps a reference to them, and they never get closed.

Change-Id: I708cfb7d2da12ea4d5c7c8f8a8bbcdf77263ddc1
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/26485
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Tested-by: Hudson CI