* get http01 challenge working
* support multiple challenge types in configurator.py
* update existing nginx tests
* lint
* refactor NginxHttp01 and NginxTlsSni01 to both now inherit from NginxChallengePerformer
* remove TODO
* challenges_test tests with both tlssni01 and http01
* Make challenges.py more abstract to make lint happier
* add pylint disables to the tests to make pylint happier about the inheritance and abstraction situation
* no need to cover raise NotImplementedError() lines
* python3 compatibility
* test that http01 perform is called
* only remove ssl from addresses during http01
* Initialize addrs_to_add
* Change Nginx http01 to modify server block so the site doesn't stop serving while getting a cert
* pass existing unit tests
* rename sni --> http01 in unit tests
* lint
* fix configurator test
* select an http block instead of https
* properly test for port number
* use domains that have matching addresses
* remove debugger
* remove access_log and error_log cruft that wasn't being executed
* continue to return None from choose_redirect_vhost when create_if_no_match is False
* add nginx integration test
* Revert "Don't save keys/csr on dry run (#4380)"
This reverts commit e034b50363.
* Don't save CSRs and keys during dry run
* Factor out _test_obtain_certificate_common
* Add test_obtain_certificate_dry_run
* Wrap key from make_key in util.Key
* Wrap result from make_csr in util.CSR
Fixes#4559.
* Update options-ssl-nginx.conf in prepare, if it hasn't been modified.
* add previous options-ssl-nginx.conf hashes
* InstallSslOptionsConfTest
* remove .new file and only print warning once
* save digest to /etc/letsencrypt
* add comment reminding devs to update hashes
* add comment and test for sha256sum
* treat hash file as text file because python3
* move constants and rename hidden digest file
* Begin breaking out cli_test.py
* simplify main
* refactor porse tests
* move determine account tests to main_test.py
* move duplicate cert test to main_test.py
* move cli stuff out of the way
* add test_renewal.py
* move error test into error_handler_test.py
* move test_read_file
* move test_no_gui out of MainTest
* move test_install_abspath to parsetest
* Move main tests into main_test.py
* move cli tests back into cli_test.py
* clean up cli_test.py
* move punycode test to util_test.py
* Fix NameError from missing plugins_disco
* Fix linting errors
* test_renewal.py -> renewal_test.py
* rm not_cli_test.py
* Move main._handle_exception test to main_test.py
* Move renewal import in renewal_test.py
from @ohemorange comments
* certbot.tests.test_util -> certbot.tests.util
* Fix issues from rebasing.
* Fix testing issue with option_was_set
* fix linting issue
