bitbake: prserv: Drop StandardError usage

StandardError doesn't exist in python 3, use Exception instead.

(Bitbake rev: 4a40046036493f0cdf0f66487ad5ce083461a5c2)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/prserv/__init__.py

@@ -10,5 +10,5 @@ def init_logger(logfile, loglevel):
     FORMAT = '%(asctime)-15s %(message)s'
     logging.basicConfig(level=numeric_level, filename=logfile, format=FORMAT)
 
-class NotFoundError(StandardError):
+class NotFoundError(Exception):
     pass