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/test_resolve.py

@@ -11,13 +11,13 @@ class TestResolve(object):
 		self.AuditConf = ssh_audit.AuditConf
 		self.audit = ssh_audit.audit
 		self.ssh = ssh_audit.SSH
-	
+
 	def _conf(self):
 		conf = self.AuditConf('localhost', 22)
 		conf.colors = False
 		conf.batch = True
 		return conf
-	
+
 	def test_resolve_error(self, output_spy, virtual_socket):
 		vsocket = virtual_socket
 		vsocket.gsock.addrinfodata['localhost#22'] = socket.gaierror(8, 'hostname nor servname provided, or not known')
@@ -25,11 +25,11 @@ class TestResolve(object):
 		conf = self._conf()
 		output_spy.begin()
 		with pytest.raises(SystemExit):
-			r = list(s._resolve(conf.ipvo))
+			list(s._resolve(conf.ipvo))
 		lines = output_spy.flush()
 		assert len(lines) == 1
 		assert 'hostname nor servname provided' in lines[-1]
-	
+
 	def test_resolve_hostname_without_records(self, output_spy, virtual_socket):
 		vsocket = virtual_socket
 		vsocket.gsock.addrinfodata['localhost#22'] = []
@@ -38,36 +38,32 @@ class TestResolve(object):
 		output_spy.begin()
 		r = list(s._resolve(conf.ipvo))
 		assert len(r) == 0
-	
+
 	def test_resolve_ipv4(self, virtual_socket):
-		vsocket = virtual_socket
 		conf = self._conf()
 		conf.ipv4 = True
 		s = self.ssh.Socket('localhost', 22)
 		r = list(s._resolve(conf.ipvo))
 		assert len(r) == 1
 		assert r[0] == (socket.AF_INET, ('127.0.0.1', 22))
-	
+
 	def test_resolve_ipv6(self, virtual_socket):
-		vsocket = virtual_socket
 		s = self.ssh.Socket('localhost', 22)
 		conf = self._conf()
 		conf.ipv6 = True
 		r = list(s._resolve(conf.ipvo))
 		assert len(r) == 1
 		assert r[0] == (socket.AF_INET6, ('::1', 22))
-	
+
 	def test_resolve_ipv46_both(self, virtual_socket):
-		vsocket = virtual_socket
 		s = self.ssh.Socket('localhost', 22)
 		conf = self._conf()
 		r = list(s._resolve(conf.ipvo))
 		assert len(r) == 2
 		assert r[0] == (socket.AF_INET, ('127.0.0.1', 22))
 		assert r[1] == (socket.AF_INET6, ('::1', 22))
-	
+
 	def test_resolve_ipv46_order(self, virtual_socket):
-		vsocket = virtual_socket
 		s = self.ssh.Socket('localhost', 22)
 		conf = self._conf()
 		conf.ipv4 = True