ctf: make search return the first matching packet in a trace

ctf: make search return the first matching packet in a trace

The CTF parser would return a random packet in search when all packets
overlap. This patch makes it return the first. Performance impacts on
properly packetized traces should be negligeable.

Change-Id: I4e9470c46b3801779ba874c4d2ccfcae88a65e16
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/96055
Reviewed-by: Hudson CI
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>
Tested-by: Patrick Tasse <patrick.tasse@gmail.com>