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_auditconf.py

@@ -9,7 +9,7 @@ class TestAuditConf(object):
 	def init(self, ssh_audit):
 		self.AuditConf = ssh_audit.AuditConf
 		self.usage = ssh_audit.usage
-	
+
 	@staticmethod
 	def _test_conf(conf, **kwargs):
 		options = {
@@ -38,11 +38,11 @@ class TestAuditConf(object):
 		assert conf.ipv4 == options['ipv4']
 		assert conf.ipv6 == options['ipv6']
 		assert conf.ipvo == options['ipvo']
-	
+
 	def test_audit_conf_defaults(self):
 		conf = self.AuditConf()
 		self._test_conf(conf)
-	
+
 	def test_audit_conf_booleans(self):
 		conf = self.AuditConf()
 		for p in ['ssh1', 'ssh2', 'batch', 'colors', 'verbose']:
@@ -52,7 +52,7 @@ class TestAuditConf(object):
 			for v in [False, 0]:
 				setattr(conf, p, v)
 				assert getattr(conf, p) is False
-	
+
 	def test_audit_conf_port(self):
 		conf = self.AuditConf()
 		for port in [22, 2222]:
@@ -62,7 +62,7 @@ class TestAuditConf(object):
 			with pytest.raises(ValueError) as excinfo:
 				conf.port = port
 			excinfo.match(r'.*invalid port.*')
-	
+
 	def test_audit_conf_ipvo(self):
 		# ipv4-only
 		conf = self.AuditConf()
@@ -114,7 +114,7 @@ class TestAuditConf(object):
 		assert conf.ipvo == (4, 6)
 		conf.ipvo = (4, 4, 4, 6, 6)
 		assert conf.ipvo == (4, 6)
-	
+
 	def test_audit_conf_level(self):
 		conf = self.AuditConf()
 		for level in ['info', 'warn', 'fail']:
@@ -124,7 +124,7 @@ class TestAuditConf(object):
 			with pytest.raises(ValueError) as excinfo:
 				conf.level = level
 			excinfo.match(r'.*invalid level.*')
-	
+
 	def test_audit_conf_cmdline(self):
 		# pylint: disable=too-many-statements
 		c = lambda x: self.AuditConf.from_cmdline(x.split(), self.usage)  # noqa