Refactoring: Made complete codebase PEP8 compatible.

Only PEP8 rule E501 (line too long) is not yet reflected
by this change.

The patch also adds automated code style checks to the
CI test stage using flake8.
It will let the tests fail if there is a code style
violation.

Change-Id: I90956dd424a46691546ef720351757d3c43451a7
Signed-off-by: peusterm <manuel.peuster@uni-paderborn.de>
diff --git a/src/emuvim/test/api_base_openstack.py b/src/emuvim/test/api_base_openstack.py
index c951665..3909e1a 100755
--- a/src/emuvim/test/api_base_openstack.py
+++ b/src/emuvim/test/api_base_openstack.py
@@ -1,35 +1,28 @@
-"""
-Copyright (c) 2015 SONATA-NFV
-ALL RIGHTS RESERVED.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-
-Neither the name of the SONATA-NFV [, ANY ADDITIONAL AFFILIATION]
-nor the names of its contributors may be used to endorse or promote
-products derived from this software without specific prior written
-permission.
-
-This work has been performed in the framework of the SONATA project,
-funded by the European Commission under Grant number 671517 through
-the Horizon 2020 and 5G-PPP programmes. The authors would like to
-acknowledge the contributions of their colleagues of the SONATA
-partner consortium (www.sonata-nfv.eu).
-"""
-
-"""
-Helper module that implements helpers for test implementations.
-"""
-
+# Copyright (c) 2015 SONATA-NFV and Paderborn University
+# ALL RIGHTS RESERVED.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Neither the name of the SONATA-NFV, Paderborn University
+# nor the names of its contributors may be used to endorse or promote
+# products derived from this software without specific prior written
+# permission.
+#
+# This work has been performed in the framework of the SONATA project,
+# funded by the European Commission under Grant number 671517 through
+# the Horizon 2020 and 5G-PPP programmes. The authors would like to
+# acknowledge the contributions of their colleagues of the SONATA
+# partner consortium (www.sonata-nfv.eu).
 import unittest
 import os
 import subprocess
@@ -40,6 +33,7 @@
 from mininet.clean import cleanup
 from mininet.node import Controller
 
+
 class ApiBaseOpenStack(unittest.TestCase):
     """
         Helper class to do basic test setups.
@@ -70,18 +64,19 @@
         """
         self.net = DCNetwork(controller=controller, **kwargs)
         for i in range(0, ndatacenter):
-            self.api.append(OpenstackApiEndpoint("0.0.0.0", 15000+i))
+            self.api.append(OpenstackApiEndpoint("0.0.0.0", 15000 + i))
 
         # add some switches
         # start from s1 because ovs does not like to have dpid = 0
         # and switch name-number is being used by mininet to set the dpid
-        for i in range(1, nswitches+1):
+        for i in range(1, nswitches + 1):
             self.s.append(self.net.addSwitch('s%d' % i))
         # if specified, chain all switches
         if autolinkswitches:
             for i in range(0, len(self.s) - 1):
                 self.net.addLink(self.s[i], self.s[i + 1])
-            self.net.addLink(self.s[2], self.s[0]) # link switches s1, s2 and s3
+            # link switches s1, s2 and s3
+            self.net.addLink(self.s[2], self.s[0])
 
         # add some data centers
         for i in range(0, ndatacenter):
@@ -89,7 +84,8 @@
                 self.net.addDatacenter(
                     'dc%d' % i,
                     metadata={"unittest_dc": i}))
-        self.net.addLink(self.dc[0].switch, self.s[0])  # link switches dc0.s1 with s1
+        # link switches dc0.s1 with s1
+        self.net.addLink(self.dc[0].switch, self.s[0])
         # connect data centers to the endpoint
         for i in range(0, ndatacenter):
             self.api[i].connect_datacenter(self.dc[i])
@@ -99,7 +95,8 @@
             self.h.append(self.net.addHost('h%d' % i))
         # add some dockers
         for i in range(0, ndockers):
-            self.d.append(self.net.addDocker('d%d' % i, dimage="ubuntu:trusty"))
+            self.d.append(self.net.addDocker('d%d' %
+                                             i, dimage="ubuntu:trusty"))
 
     def startApi(self):
         for i in self.api:
@@ -129,25 +126,26 @@
         """
         List the containers managed by containernet
         """
-        return self.getDockerCli().containers(filters={"label": "com.containernet"})
+        return self.getDockerCli().containers(
+            filters={"label": "com.containernet"})
 
     @staticmethod
     def setUp():
         pass
 
-
     def tearDown(self):
         time.sleep(2)
         print('->>>>>>> tear everything down ->>>>>>>>>>>>>>>')
-        self.stopApi() # stop all flask threads
-        self.stopNet() # stop some mininet and containernet stuff
+        self.stopApi()  # stop all flask threads
+        self.stopNet()  # stop some mininet and containernet stuff
         cleanup()
         # make sure that all pending docker containers are killed
-        with open(os.devnull, 'w') as devnull: # kill a possibly running docker process that blocks the open ports
+        # kill a possibly running docker process that blocks the open ports
+        with open(os.devnull, 'w') as devnull:
             subprocess.call("kill $(netstat -npl | grep '15000' | grep -o -e'[0-9]\+/docker' | grep -o -e '[0-9]\+')",
-                stdout=devnull,
-                stderr=devnull,
-                shell=True)
+                            stdout=devnull,
+                            stderr=devnull,
+                            shell=True)
 
         with open(os.devnull, 'w') as devnull:
             subprocess.call(
@@ -156,8 +154,3 @@
                 stderr=devnull,
                 shell=True)
         time.sleep(2)
-
-
-
-
-