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_software.py

@@ -8,13 +8,13 @@ class TestSoftware(object):
 	@pytest.fixture(autouse=True)
 	def init(self, ssh_audit):
 		self.ssh = ssh_audit.SSH
-	
+
 	def test_unknown_software(self):
 		ps = lambda x: self.ssh.Software.parse(self.ssh.Banner.parse(x))  # noqa
 		assert ps('SSH-1.5') is None
 		assert ps('SSH-1.99-AlfaMegaServer') is None
 		assert ps('SSH-2.0-BetaMegaServer 0.0.1') is None
-	
+
 	def test_openssh_software(self):
 		# pylint: disable=too-many-statements
 		ps = lambda x: self.ssh.Software.parse(self.ssh.Banner.parse(x))  # noqa
@@ -102,7 +102,7 @@ class TestSoftware(object):
 		assert s.display(True) == str(s)
 		assert s.display(False) == 'OpenSSH 5.9'
 		assert repr(s) == '<Software(product=OpenSSH, version=5.9, patch=CASPUR)>'
-	
+
 	def test_dropbear_software(self):
 		ps = lambda x: self.ssh.Software.parse(self.ssh.Banner.parse(x))  # noqa
 		# common
@@ -153,7 +153,7 @@ class TestSoftware(object):
 		assert s.display(True) == str(s)
 		assert s.display(False) == 'Dropbear SSH 2014.66'
 		assert repr(s) == '<Software(product=Dropbear SSH, version=2014.66, patch=agbn_1)>'
-	
+
 	def test_libssh_software(self):
 		ps = lambda x: self.ssh.Software.parse(self.ssh.Banner.parse(x))  # noqa
 		# common
@@ -179,7 +179,7 @@ class TestSoftware(object):
 		assert s.display(True) == str(s)
 		assert s.display(False) == str(s)
 		assert repr(s) == '<Software(product=libssh, version=0.7.4)>'
-	
+
 	def test_romsshell_software(self):
 		ps = lambda x: self.ssh.Software.parse(self.ssh.Banner.parse(x))  # noqa
 		# common
@@ -194,7 +194,7 @@ class TestSoftware(object):
 		assert s.display(True) == str(s)
 		assert s.display(False) == str(s)
 		assert repr(s) == '<Software(vendor=Allegro Software, product=RomSShell, version=5.40)>'
-	
+
 	def test_hp_ilo_software(self):
 		ps = lambda x: self.ssh.Software.parse(self.ssh.Banner.parse(x))  # noqa
 		# common
@@ -209,7 +209,7 @@ class TestSoftware(object):
 		assert s.display(True) == str(s)
 		assert s.display(False) == str(s)
 		assert repr(s) == '<Software(vendor=HP, product=iLO (Integrated Lights-Out) sshd, version=0.2.1)>'
-	
+
 	def test_cisco_software(self):
 		ps = lambda x: self.ssh.Software.parse(self.ssh.Banner.parse(x))  # noqa
 		# common
@@ -224,7 +224,7 @@ class TestSoftware(object):
 		assert s.display(True) == str(s)
 		assert s.display(False) == str(s)
 		assert repr(s) == '<Software(vendor=Cisco, product=IOS/PIX sshd, version=1.25)>'
-	
+
 	def test_software_os(self):
 		ps = lambda x: self.ssh.Software.parse(self.ssh.Banner.parse(x))  # noqa
 		# unknown