Fixes#7420.
* Set up CentOS 8 test farm tests
* Don't add to apache2_targets until 7273 is resolved
* Start upgrade test from a version that works on centos 8
* remove when possible from targets
This PR fixes the Travis failures that can be seen https://travis-ci.com/certbot/certbot/builds/160258644. Running the tests locally, it looks like Ubuntu has started shutting down the 19.04 repos which makes sense as this release has been EOL'd. See https://wiki.ubuntu.com/Releases.
I have the full suite including the test farm tests running at https://travis-ci.com/github/certbot/certbot/builds/160269969 with this change.
The issue of adding 19.10 to our test farm tests is tracked by #7851. I think that issue is important and it's in our current milestone, but I'd personally rather get our tests passing for now and try to expand them to run on other systems later.
Inspired by the number of ARM users we have (and because I want to rip out the only 32 bit test we have which without this PR would remove all tests we have on non-x86_64 architectures), this test adds an ARM image to the test farm tests. The image ID was taken from https://wiki.debian.org/Cloud/AmazonEC2Image/Stretch, you can see tests passing at https://travis-ci.com/certbot/certbot/builds/116857897, and I ran test_tests.sh locally and it passed.
Fixes#6955.
This updates the Fedora version used in our test farm tests to Fedora 30. The AMI ID comes from https://alt.fedoraproject.org/cloud/ where it is listed as their standard HVM AMI for the region we use us-east-1 (US East (N. Virginia)).
Unfortunately, there were a lot of small changes required for this. The big reason for this is on Fedora, there isn't a Python 2 executable installed. In fact, there's not even an executable named python. It's just python3. Rather than installing another Python in each test, I wrote a script that the test scripts can share to figure out the different paths and names that should be used in their script. (This isn't used in test_sdists.sh because the logic is a little different.)
Other changes here worth flagging are:
I changed the name of the variable RUN_PYTHON3_TESTS in test_leauto_upgrades.sh to RUN_RHEL6_TESTS. The tests that are run when this variable is set test the upgrade from Python 2 to Python 3 on RHEL 6. I think this new name is much better now that we also have Fedora running Python 3.
I made tools/simple_http_server.py work on Python 3.
You can see tests passing with these changes at https://travis-ci.com/certbot/certbot/builds/113821476. I also ran test_tests.sh and they passed.
* Update to Fedora 30 in test farm tests.
Fedora 28 is likely to reach its EOL soon.
* Add set_python_envvars.sh.
* Fix test_apache2.sh on python3 only distros.
* Fix test_leauto_upgrades.sh on python3 systems.
* Fix certonly_standalone tests with python3 only
* Fix test_sdists.sh on python3 only distros.
* Make simple_http_server.py work on Python 3.
* add comments
