clean up unused Python imports (#454)

* Remove unused python imports

These changes have been auto-generated with:

	pip3 install isort autoflake
	isort -rc -sl .
	autoflake --remove-all-unused-imports -i -r .
	isort -rc -m 3 .

Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

* python: remove redundant parenthesis

Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

utils/p4runtime_lib/simple_controller.py

@@ -19,11 +19,10 @@ import json
 import os
 import sys
 
-from . import bmv2
-from . import helper
-
 from p4.config.v1 import p4info_pb2
 
+from . import bmv2, helper
+
 
 def error(msg):
     print(' - ERROR! ' + msg, file=sys.stderr)