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/mininet/appcontroller.py

@@ -2,6 +2,7 @@ import subprocess
 
 from shortest_path import ShortestPath
 
+
 class AppController:
 
     def __init__(self, manifest=None, target=None, topo=None, net=None, links=None):

utils/mininet/apptopo.py

@@ -1,5 +1,6 @@
 from mininet.topo import Topo
 
+
 class AppTopo(Topo):
 
     def __init__(self, links, latencies={}, manifest=None, target=None,

utils/mininet/multi_switch_mininet.py

@@ -15,25 +15,21 @@
 # limitations under the License.
 #
 
-import signal
-import os
-import sys
-import subprocess
 import argparse
-import json
 import importlib
+import json
+import os
 import re
+import sys
 from time import sleep
 
-from mininet.net import Mininet
-from mininet.topo import Topo
-from mininet.link import TCLink
-from mininet.log import setLogLevel, info
-from mininet.cli import CLI
-
-from p4_mininet import P4Switch, P4Host
-import apptopo
 import appcontroller
+import apptopo
+from mininet.cli import CLI
+from mininet.link import TCLink
+from mininet.log import setLogLevel
+from mininet.net import Mininet
+from p4_mininet import P4Host, P4Switch
 
 parser = argparse.ArgumentParser(description='Mininet demo')
 parser.add_argument('--behavioral-exe', help='Path to behavioral executable',

utils/mininet/p4_mininet.py

@@ -13,15 +13,16 @@
 # limitations under the License.
 #
 
-from mininet.net import Mininet
-from mininet.node import Switch, Host
-from mininet.log import setLogLevel, info, error, debug
-from mininet.moduledeps import pathCheck
+import os
+import socket
+import tempfile
 from sys import exit
 from time import sleep
-import os
-import tempfile
-import socket
+
+from mininet.log import debug, error, info
+from mininet.moduledeps import pathCheck
+from mininet.node import Host, Switch
+
 
 class P4Host(Host):
     def config(self, **params):

utils/mininet/single_switch_mininet.py

@@ -15,17 +15,16 @@
 # limitations under the License.
 #
 
-from mininet.net import Mininet
-from mininet.topo import Topo
-from mininet.log import setLogLevel, info
-from mininet.cli import CLI
-
-from p4_mininet import P4Switch, P4Host
-
 import argparse
 from subprocess import PIPE, Popen
 from time import sleep
 
+from mininet.cli import CLI
+from mininet.log import setLogLevel
+from mininet.net import Mininet
+from mininet.topo import Topo
+from p4_mininet import P4Host, P4Switch
+
 parser = argparse.ArgumentParser(description='Mininet demo')
 parser.add_argument('--behavioral-exe', help='Path to behavioral executable',
                     type=str, action="store", required=True)