Deprecate certbot-auto on Debian systems (#8354)

Fixes #8294.

* Deprecate certbot-auto on Debian systems.

* Add changelog entry.

* Remove le_auto_xenial test.

* Update certbot-auto test farm tests.

* Add comments explaining expected behavior.

letsencrypt-auto-source/Dockerfile.xenial

@@ -1,36 +0,0 @@
-# For running tests, build a docker image with a passwordless sudo and a trust
-# store we can manipulate.
-
-FROM ubuntu:xenial
-
-# Add an unprivileged user:
-RUN useradd --create-home --home-dir /home/lea --shell /bin/bash --groups sudo --uid 1000 lea
-
-# Install pip, sudo, and openssl:
-RUN apt-get update && \
-    apt-get -q -y install python-pip sudo openssl && \
-    apt-get clean
-
-# Use pipstrap to update to a stable and tested version of pip
-COPY ./pieces/pipstrap.py /opt
-RUN /opt/pipstrap.py
-# Pin pytest version for increased stability
-RUN pip install pytest==3.2.5 six==1.10.0
-
-# Let that user sudo:
-RUN sed -i.bkp -e \
-      's/%sudo\s\+ALL=(ALL\(:ALL\)\?)\s\+ALL/%sudo ALL=NOPASSWD:ALL/g' \
-      /etc/sudoers
-
-RUN mkdir -p /home/lea/certbot
-
-# Install fake testing CA:
-COPY ./tests/certs/ca/my-root-ca.crt.pem /usr/local/share/ca-certificates/
-
-# Copy code:
-COPY . /home/lea/certbot/letsencrypt-auto-source
-
-USER lea
-WORKDIR /home/lea
-
-CMD ["pytest", "-v", "-s", "certbot/letsencrypt-auto-source/tests"]

letsencrypt-auto-source/letsencrypt-auto

@@ -799,11 +799,7 @@ BootstrapMageiaCommon() {
 # that function. If Bootstrap is set to a function that doesn't install any
 # packages BOOTSTRAP_VERSION is not set.
 if [ -f /etc/debian_version ]; then
-  Bootstrap() {
-    BootstrapMessage "Debian-based OSes"
-    BootstrapDebCommon
-  }
-  BOOTSTRAP_VERSION="BootstrapDebCommon $BOOTSTRAP_DEB_COMMON_VERSION"
+  DEPRECATED_OS=1
 elif [ -f /etc/mageia-release ]; then
   # Mageia has both /etc/mageia-release and /etc/redhat-release
   DEPRECATED_OS=1

letsencrypt-auto-source/letsencrypt-auto.template

@@ -321,11 +321,7 @@ DeterminePythonVersion() {
 # that function. If Bootstrap is set to a function that doesn't install any
 # packages BOOTSTRAP_VERSION is not set.
 if [ -f /etc/debian_version ]; then
-  Bootstrap() {
-    BootstrapMessage "Debian-based OSes"
-    BootstrapDebCommon
-  }
-  BOOTSTRAP_VERSION="BootstrapDebCommon $BOOTSTRAP_DEB_COMMON_VERSION"
+  DEPRECATED_OS=1
 elif [ -f /etc/mageia-release ]; then
   # Mageia has both /etc/mageia-release and /etc/redhat-release
   DEPRECATED_OS=1