ctf: Move non-aligned reads to a unified method

ctf: Move non-aligned reads to a unified method

* Clean up integer reading
* Clean up string reading
* Clean up enumeration reading
* Clean up float reading
* Clean up structure reading

Change-Id: I3627f0c1aaecbaa84d861cba05c0681a7b267388
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/17465
IP-Clean: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Tested-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Tested-by: Hudson CI
Reviewed-by: Etienne Bergeron <etienne.bergeron@gmail.com>
Reviewed-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>