Switch to uwsgi

Use the opendev uwsgi base image.  A few additional changes are
needed beyond the container switch:

* WSGI protocol says headers must be a python list.  Uwsgi is very
  literal about that and does not permit an iterable, so we coerce
  items() to a list.
* Add the zuul_storage_proxy package to the setup.cfg files list so
  it gets installed.
* Remove a debug print.

Change-Id: I801d8b37699af8b937cc68d32f2a85c50eb91eb9

Dockerfile

@@ -3,10 +3,11 @@ FROM docker.io/opendevorg/python-builder as builder
 COPY . /tmp/src
 RUN assemble
 
-FROM docker.io/opendevorg/python-base as zuul-storage-proxy
+FROM docker.io/opendevorg/uwsgi-base as zuul-storage-proxy
 
 COPY --from=builder /output/ /output
 RUN /output/install-from-bindep
 
 EXPOSE 8000
-CMD ["/usr/local/bin/gunicorn", "-k", "eventlet", "-t", "3600", "--workers", "10", "swift_proxy:proxy"]
+ENV UWSGI_HTTP_SOCKET=:8000 UWSGI_PROCESSES=10 UWSGI_THREADS=1
+CMD uwsgi --mount /=zuul_storage_proxy:proxy

requirements.txt

@@ -1,2 +1 @@
-gunicorn[eventlet]
 openstacksdk

setup.cfg

@@ -6,3 +6,7 @@ requires-dist =
 
 [pbr]
 warnerrors = True
+
+
+[files]
+packages = zuul_storage_proxy

zuul_storage_proxy/__init__.py

@@ -102,7 +102,7 @@ def handle_get(start_response, clouds, container, path):
 
             start_response(
                 "{} {}".format(response.status_code, response.reason),
-                response_headers.items())
+                list(response_headers.items()))
 
             # We want to forward the compressed data stream here so use the raw
             # response stream.
@@ -163,7 +163,6 @@ def swift_proxy(environ, start_response, clouds, container_prefix):
     path = components[1]
     container = container_prefix + container
 
-    print('%s request %s/%s' % (method, container, path))
     try:
         if method == 'GET':
             for chunk in handle_get(start_response, clouds, container, path):