Flake8 fixes (#35)

* Apply Flake8 also on `setup.py`

modified:   tox.ini

* Fix W605 - invalid escape syntax

modified:   packages/setup.py
modified:   tox.ini

* Update comment about Flake8: W504

W503 and W504 are mutual exclusive - so we have to keep one of them.

modified:   tox.ini

* Fix F841 - variable assigned but never used

modified:   ssh-audit.py
modified:   tox.ini

* Fix E741 - ambiguous variable name 'l'

modified:   ssh-audit.py
modified:   tox.ini

* Fix E712 - comparison to False should be 'if cond is False'

... and not 'if conf == False'.

modified:   ssh-audit.py
modified:   tox.ini

* Fix E711 - comparison to None should be 'if cond is not None'

... and not 'if cond != None'.

modified:   ssh-audit.py
modified:   tox.ini

* Fix E305 - expected 2 blank lines

... after class or function definition, found 1.

modified:   ssh-audit.py
modified:   tox.ini

* Fix E303 - too many blank lines

modified:   ssh-audit.py
modified:   tox.ini

* Fix E303 - too many blank lines

modified:   ssh-audit.py
modified:   tox.ini

* Fix E301 - expected 1 blank line, found 0

No code change necessary, probably fixed by another commit.

modified:   tox.ini

* Fix E265 - block comment should start with '# '

There is lots of commented out code, which usually should be just
deleted.

I will keep it for now, as I am not yet very familiar with the code
base.

modified:   ssh-audit.py
modified:   tox.ini

* Fix E261 - at least two spaces before inline comment

modified:   ssh-audit.py
modified:   tox.ini

* Fix E251 - unexpected spaces around keyword / parameter equals

modified:   packages/setup.py
modified:   tox.ini

* Fix E231 - missing whitespace after ','

No code change necessary, probably fixed by previous commit.

modified:   tox.ini

* Fix E226 - missing whitespace around arithmetic operator

modified:   ssh-audit.py
modified:   tox.ini

* Fix W293 - blank line contains whitespace

modified:   ssh-audit.py
modified:   tox.ini

* Fix E221 - multiple spaces before operator

modified:   ssh-audit.py
modified:   tox.ini

* Update comment about Flake 8 E241

Lots of data is formatted as tables, so this warning is disabled for a
good reason.

modified:   tox.ini

* Fix E401 - multiple imports on one line

modified:   ssh-audit.py
modified:   tox.ini

* Do not ignore Flake8 warning F401

... as there were no errors in source code anyway.

modified:   tox.ini

* Fix F821 - undefined name

modified:   ssh-audit.py
modified:   tox.ini

* Reformat ignore section for Flake8

modified:   tox.ini

* Flake8 test suite

modified:   test/conftest.py
modified:   test/test_auditconf.py
modified:   test/test_banner.py
modified:   test/test_buffer.py
modified:   test/test_errors.py
modified:   test/test_output.py
modified:   test/test_resolve.py
modified:   test/test_socket.py
modified:   test/test_software.py
modified:   test/test_ssh1.py
modified:   test/test_ssh2.py
modified:   test/test_ssh_algorithm.py
modified:   test/test_utils.py
modified:   test/test_version_compare.py
modified:   tox.ini

test/conftest.py

@@ -27,7 +27,7 @@ class _OutputSpy(list):
 		self.__out = StringIO()
 		self.__old_stdout = sys.stdout
 		sys.stdout = self.__out
-		
+
 	def flush(self):
 		lines = self.__out.getvalue().splitlines()
 		sys.stdout = self.__old_stdout
@@ -44,12 +44,12 @@ class _VirtualGlobalSocket(object):
 	def __init__(self, vsocket):
 		self.vsocket = vsocket
 		self.addrinfodata = {}
-	
+
 	# pylint: disable=unused-argument
 	def create_connection(self, address, timeout=0, source_address=None):
 		# pylint: disable=protected-access
 		return self.vsocket._connect(address, True)
-	
+
 	# pylint: disable=unused-argument
 	def socket(self,
 	           family=socket.AF_INET,
@@ -57,7 +57,7 @@ class _VirtualGlobalSocket(object):
 	           proto=0,
 	           fileno=None):
 		return self.vsocket
-	
+
 	def getaddrinfo(self, host, port, family=0, socktype=0, proto=0, flags=0):
 		key = '{0}#{1}'.format(host, port)
 		if key in self.addrinfodata:
@@ -85,41 +85,41 @@ class _VirtualSocket(object):
 		self.sdata = []
 		self.errors = {}
 		self.gsock = _VirtualGlobalSocket(self)
-	
+
 	def _check_err(self, method):
 		method_error = self.errors.get(method)
 		if method_error:
 			raise method_error
-	
+
 	def connect(self, address):
 		return self._connect(address, False)
-	
+
 	def _connect(self, address, ret=True):
 		self.peer_address = address
 		self._connected = True
 		self._check_err('connect')
 		return self if ret else None
-	
+
 	def settimeout(self, timeout):
 		self.timeout = timeout
-	
+
 	def gettimeout(self):
 		return self.timeout
-	
+
 	def getpeername(self):
 		if self.peer_address is None or not self._connected:
 			raise socket.error(57, 'Socket is not connected')
 		return self.peer_address
-	
+
 	def getsockname(self):
 		return self.sock_address
-	
+
 	def bind(self, address):
 		self.sock_address = address
-	
+
 	def listen(self, backlog):
 		pass
-	
+
 	def accept(self):
 		# pylint: disable=protected-access
 		conn = _VirtualSocket()
@@ -127,7 +127,7 @@ class _VirtualSocket(object):
 		conn.peer_address = ('127.0.0.1', 0)
 		conn._connected = True
 		return conn, conn.peer_address
-	
+
 	def recv(self, bufsize, flags=0):
 		# pylint: disable=unused-argument
 		if not self._connected:
@@ -138,7 +138,7 @@ class _VirtualSocket(object):
 		if isinstance(data, Exception):
 			raise data
 		return data
-	
+
 	def send(self, data):
 		if self.peer_address is None or not self._connected:
 			raise socket.error(32, 'Broken pipe')