ctf: Fix buffer overflow traces from crashing batch import

ctf: Fix buffer overflow traces from crashing batch import

Buffer overflows are caused here by synthetic traces that aim to
behave maliciously. The parser already handles these attacks, but
the BufferOverflowException will cause the batch import trace wizard
to stop scanning. This fix catches buffer overflows in the validation
and warns that the error is serious.

Change-Id: Ie9156cfaac0944763e3d1dc798c42f1d64753560
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/14088
Tested-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
IP-Clean: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>