* prevent regressions of #5082
* Fix test_leauto_upgrades.sh
test_leauto_upgrades.sh has been incorrectly been succeeding because while peep
doesn't work with newer versions of pip and letsencrypt-auto would crash,
the output included the version number so we reported the test as passing.
This updates letsencrypt-auto to the oldest version that still works for the
purpose of the test and sets pipefail so errors are properly reported.
* Test symlink creation in test_leauto_upgrades.sh
* Pin dependencies in test_sdists.sh.
* Fix permissions errors in test_tests.sh
* add get_certbot_version.sh
* Use get_certbot_version.sh in build.py
* make test_leauto_upgrades.sh more robust
* auto upgrades break tests
* OCSP experimental is not needed anymore
* Add test_sdists.sh
* Use LE_AUTO_VERSION, not repo version
* install OS deps earlier
* use readlink not realpath
* undo changes to build.py
* Factor out version code from build.py
* Use version.py in test_sdists
* Remove get_certbot_version
* workaround setuptools breakage
