Running "tcpdump -D" on target seems to be a expensive operation in some
cases, not finishing within the 500ms timeout on several devices (~1000 ms
in one of our cases).
Change-Id: I57e4d31f12c4e393ff84e79b64cb024b74a11f0e
Reviewed-on: https://code.wireshark.org/review/24719
Reviewed-by: Michal Labedzki <michal.labedzki@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>