device.remote_opts.sampling_method and device.remote_opts.sampling_param
 only exists if we have HAVE_PCAP_SETSAMPLING.

Change-Id: I60b98fd0539d1a8f4fcdd3a079f39f8062a43844
Reviewed-on: https://code.wireshark.org/review/3429
Reviewed-by: Anders Broman <a.broman58@gmail.com>