tools/syscount: convert syscall and process names to bytes array
tools/syscount: convert syscall and process names to bytes array

subprocess.check_output() returns a bytes array in python3 while it
returns str in python2. To improve the compatibility, convert the
related fields to bytes arrays and print them with printb().

Signed-off-by: Gary Lin <a057d4b27e9e9055b973f54b519db54c22ed5ee8@suse.com>

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