Pass the global capture options to open_capture_device().

If we support setting the time stamp precision, we need it to determine
whether we're writing a pcap-ng file so we know whether to request
nanosecond precision or not.

Change-Id: I7df19c1afbe1ba90c40c49aef79f6f88ce5df29b
Reviewed-on: https://code.wireshark.org/review/4359
Reviewed-by: Guy Harris <guy@alum.mit.edu>