Delete or update references to Debian 8 Jessie (#8065)

* Delete or update references to Debian 8 Jessie

* Don't delete oldest constraints from Jessie, but document in comments.

* Update tools/oldest_constraints.txt

Co-authored-by: ohemorange <ebportnoy@gmail.com>

Co-authored-by: Brad Warren <bmw@users.noreply.github.com>
Co-authored-by: ohemorange <ebportnoy@gmail.com>

certbot/docs/install.rst

@@ -250,9 +250,6 @@ through a command like:
 They can be installed by running the same installation command above but
 replacing ``certbot`` with the name of the desired package.
 
-There are no Certbot packages available for Debian Jessie and Jessie users
-should instead use certbot-auto_.
-
 **Ubuntu**
 
 If you run Ubuntu Trusty, Xenial, or Bionic, certbot is available through the official PPA,

certbot/docs/using.rst

@@ -631,7 +631,6 @@ systemd timers (`systemctl list-timers`).
    :header: "Distribution Name", "Distribution Version", "Automation Method"
 
    "CentOS", "EPEL 7", "systemd"
-   "Debian", "jessie", "cron, systemd"
    "Debian", "stretch", "cron, systemd"
    "Debian", "testing/sid", "cron, systemd"
    "Fedora", "26", "systemd"

letsencrypt-auto-source/rebuild_dependencies.py

@@ -27,7 +27,7 @@ import argparse
 # The list of docker distributions to test dependencies against with.
 DISTRIBUTION_LIST = [
     'ubuntu:18.04', 'ubuntu:16.04',
-    'debian:stretch', 'debian:jessie',
+    'debian:stretch',
     'centos:7', 'centos:6',
     'opensuse/leap:15',
     'fedora:29',

tests/letstest/apache2_targets.yaml

@@ -36,11 +36,6 @@ targets:
     virt: hvm
     user: admin
     machine_type: a1.medium
-  - ami: ami-077bf3962f29d3fa4
-    name: debian8.1
-    type: ubuntu
-    virt: hvm
-    user: admin
   #-----------------------------------------------------------------------------
   # Fedora
   - ami: ami-0fcbe88944a53b4c8

tests/letstest/targets.yaml

@@ -36,11 +36,6 @@ targets:
     virt: hvm
     user: admin
     machine_type: a1.medium
-  - ami: ami-077bf3962f29d3fa4
-    name: debian8.1
-    type: ubuntu
-    virt: hvm
-    user: admin
     # userdata: |
     #   #cloud-init
     #   runcmd:

tools/oldest_constraints.txt

@@ -26,6 +26,9 @@ zope.event==4.0.3
 zope.interface==4.0.5
 
 # Debian Jessie Backports constraints
+# Debian Jessie has reached end of life. However:
+# When it becomes necessary to upgrade any of these dependencies, you should only update them to the oldest version of the package found
+# in a non-EOL'd version of CentOS, Debian, or Ubuntu that has Certbot packages in their OS repositories.
 PyICU==1.8
 colorama==0.3.2
 enum34==1.0.3