Refactor overpass to hold higher standards

1. Replace requirements.txt with Pipfile
2. Refactor handler.py and auth.py to different submodules each doing one thing and one thing only
3. Add tests!

.gitignore

@@ -17,6 +17,7 @@ venv/
 .installed.cfg
 *.egg
 *__pycache__*
+*pytest_cache*
 
 # Serverless directories
 .serverless

.python-version

@@ -0,0 +1 @@
+3.8.0

Dockerfile

@@ -0,0 +1,16 @@
+FROM python:3.8-slim AS base
+
+COPY . /app
+
+WORKDIR /app
+
+# set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+ENV PIPENV_VENV_IN_PROJECT 1
+RUN pip install pipenv && \
+    pipenv install --deploy -d
+
+FROM base AS test
+WORKDIR /app
+CMD pipenv run pytest

Pipfile

@@ -0,0 +1,36 @@
+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+boto3 = "==1.9.220"
+botocore = "==1.12.220"
+cachetools = "==3.1.1"
+certifi = "==2019.6.16"
+chardet = "==3.0.4"
+crhelper = "==2.0.3"
+docutils = "==0.15.2"
+google-auth = "==1.6.3"
+idna = "==2.8"
+jmespath = "==0.9.4"
+kubernetes = "==10.0.1"
+oauthlib = "==3.1.0"
+pyasn1 = "==0.4.6"
+pyasn1-modules = "==0.2.6"
+python-dateutil = "==2.8.0"
+requests = "==2.22.0"
+requests-oauthlib = "==1.2.0"
+rsa = "==4.0"
+s3transfer = "==0.2.1"
+six = "==1.12.0"
+urllib3 = "==1.25.3"
+PyYAML = "==5.1.2"
+websocket_client = "==0.56.0"
+pytest = "*"
+assertpy = "*"
+
+[requires]
+python_version = "3.8"