meta/selftest/scripts: Use print function for python3 compatibility

Used print function instead of print statement to make
the code work in python 3.

[Changes from both Ed and Richard]

(From OE-Core rev: ced1995694c394d92cb82fb9c25a33dc027a3b69)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/utils.py

@@ -265,7 +265,7 @@ class ThreadedWorker(Thread):
             try:
                 func(self, *args, **kargs)
             except Exception, e:
-                print e
+                print(e)
             finally:
                 self.tasks.task_done()