Add overall python code QA and guidelines with flake8

ScyllaDB loves python & python loves ScyllaDB.

It would benefit the project to start enforcing some code guidelines
and basic QA with a linter along a PEP8 respect thanks to flake8.

This patch adds a tox config to at least start with an assessment
of the work to be done on all .py files in the code base.

To reduce its noise, tests on long lines (> 80char) are ignored
for now.

Signed-off-by: Ultrabug <ultrabug@gentoo.org>
Message-Id: <20170726134242.8927-1-ultrabug@gentoo.org>

.gitignore

@@ -13,4 +13,8 @@ Cql.tokens
 .kdev4
 *.kdev4
 CMakeLists.txt.user
+.cache
+.tox
+*.egg-info
+__pycache__CMakeLists.txt.user
 .gdbinit

setup.py

@@ -0,0 +1,12 @@
+from setuptools import find_packages, setup
+
+setup(
+    name="scylla",
+    description='NoSQL data store using the seastar framework, compatible with Apache Cassandra',
+    url='https://github.com/scylladb/scylla',
+    download_url='https://github.com/scylladb/scylla/tags',
+    license='AGPL',
+    platforms='any',
+    packages=find_packages(),
+    include_package_data=True,
+    install_requires=[])

tox.ini

@@ -0,0 +1,20 @@
+[tox]
+usedevelop=True
+skipdist=True
+
+[testenv]
+deps =
+    pytest
+    pytest-flake8
+
+commands =
+    pytest --flake8 -k 'not tests'
+
+[flake8]
+max-line-length = 120
+exclude = .ropeproject,.tox,tests
+show-source = False
+
+[pytest]
+flake8-ignore =
+    E501