Remove tox

Seems tox is not used anywhere, so there is no need to have it then.
Especially when it messes with pytest. In some cases it can change the
config dir in pytest run.

Closes scylladb/scylladb#22819

setup.py

@@ -1,21 +0,0 @@
-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='ScyllaDB-Source-Available-1.0',
-    platforms='any',
-    packages=find_packages(),
-    include_package_data=True,
-    install_requires=[],
-    classifiers=[
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.4",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-    ],
-)

tox.ini

@@ -1,20 +0,0 @@
-[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