Fix DBus interface and add Linux Kernel messages interface

Hi,
One commit oneline is for fix issue with Wireshark, so capture with DBus should be now possible. Second commit add new interface to collect Linux Kernel messages by /dev/kmsg. Commit contain DLT/Linktype for new interface. Feel free to fix/change the patches. You can read about /dev/kmsg here: https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/Documentation/ABI/testing/dev-kmsg