Prepare for the 0.33.1 release. (#6915)

The changelog should still say <version> - master because it will be fixed up automatically by the release script at https://github.com/certbot/certbot/blob/master/tools/_release.sh#L69.

* Protect certbot-auto against non numerical version release in some RPM distributions (#6913)

Fixes #6912

Bash evaluate all condition in a predicate statement, eg. `"$SOMEVAR" = "test" -a "$ANOTHERVAR" = "test2"`, even if it is not necessary, for instance if the first condition is false in the example here.

As a consequence, on non-Fedora distributions, an evaluation of the distribution version could be done on non numeric value, eg. `"6.7" -eq "29"`, making certbot-auto failing in this case.

This PR fixes that, by evaluating the version on RPM distributions only if we are on Fedora. Otherwise, version will be "0".

(cherry picked from commit c2d9ea1f61)

* Update changelog about #6912 fix. (#6914)

(cherry picked from commit 30eafba997)

* cleanup changelog

CHANGELOG.md

@@ -2,6 +2,19 @@
 
 Certbot adheres to [Semantic Versioning](https://semver.org/).
 
+## 0.33.1 - master
+
+### Fixed
+
+* A bug causing certbot-auto to print warnings or crash on some RHEL based
+  systems has been resolved.
+
+Despite us having broken lockstep, we are continuing to release new versions of
+all Certbot components during releases for the time being, however, the only
+changes in this release were to certbot-auto.
+
+More details about these changes can be found on our GitHub repo.
+
 ## 0.33.0 - 2019-04-03
 
 ### Added

letsencrypt-auto-source/letsencrypt-auto

@@ -750,7 +750,10 @@ elif [ -f /etc/redhat-release ]; then
   DeterminePythonVersion "NOCRASH"
   # Starting to Fedora 29, python2 is on a deprecation path. Let's move to python3 then.
   RPM_DIST_NAME=`(. /etc/os-release 2> /dev/null && echo $ID) || echo "unknown"`
-  RPM_DIST_VERSION=`(. /etc/os-release 2> /dev/null && echo $VERSION_ID) || echo "0"`
+  RPM_DIST_VERSION=0
+  if [ "$RPM_DIST_NAME" = "fedora" ]; then
+    RPM_DIST_VERSION=`(. /etc/os-release 2> /dev/null && echo $VERSION_ID) || echo "0"`
+  fi
   if [ "$RPM_DIST_NAME" = "fedora" -a "$RPM_DIST_VERSION" -ge 29 -o "$PYVER" -eq 26 ]; then
     Bootstrap() {
       BootstrapMessage "RedHat-based OSes that will use Python3"

letsencrypt-auto-source/letsencrypt-auto.template

@@ -325,7 +325,10 @@ elif [ -f /etc/redhat-release ]; then
   DeterminePythonVersion "NOCRASH"
   # Starting to Fedora 29, python2 is on a deprecation path. Let's move to python3 then.
   RPM_DIST_NAME=`(. /etc/os-release 2> /dev/null && echo $ID) || echo "unknown"`
-  RPM_DIST_VERSION=`(. /etc/os-release 2> /dev/null && echo $VERSION_ID) || echo "0"`
+  RPM_DIST_VERSION=0
+  if [ "$RPM_DIST_NAME" = "fedora" ]; then
+    RPM_DIST_VERSION=`(. /etc/os-release 2> /dev/null && echo $VERSION_ID) || echo "0"`
+  fi
   if [ "$RPM_DIST_NAME" = "fedora" -a "$RPM_DIST_VERSION" -ge 29 -o "$PYVER" -eq 26 ]; then
     Bootstrap() {
       BootstrapMessage "RedHat-based OSes that will use Python3"