tools: fix printb usage in solisten
tools: fix printb usage in solisten

Since its conversion to printb, solisten has suffers from yet another python2/3 bytes/str issue:

Traceback (most recent call last):
  File "_ctypes/callbacks.c", line 234, in 'calling callback function'
  File "/usr/lib/python3.6/site-packages/bcc/table.py", line 581, in raw_cb_
    callback(cpu, data, size)
  File "/usr/share/bcc/tools/solisten", line 176, in print_event
    event.lport, address,
TypeError: %b requires a bytes-like object, or an object that implements __bytes__, not 'str'

This patch fix the issue on python3. The tools still works on python2.

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