zfsdist: fix for python3
zfsdist: fix for python3

The BPF.get_kprobe_functions method tests if the passed argument
matches with a line of kallsyms, which is opened in binary mode.
Therefore the regex pattern must be bytes as well.

tuxology/bcc,iovisor/bcc,brendangregg/bcc,mcaleavya/bcc,brendangregg/bcc,mcaleavya/bcc,iovisor/bcc,mcaleavya/bcc,iovisor/bcc,brendangregg/bcc,tuxology/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc,tuxology/bcc,iovisor/bcc,tuxology/bcc,tuxology/bcc,mcaleavya/bcc,mcaleavya/bcc