* Add TLS-SNI-01 support to Manual plugin
* Add environment variable CERTBOT_SNI_DOMAIN for manual-auth-hook
* Make AuthenticatorTest inherit from TempDirTestCase
* Add test_get_z_domain()
* Document CERTBOT_SNI_DOMAIN in docs/using.rst
* Start of combined manual/script plugin
* Return str from hooks.execute, not bytes
* finish manual/script rewrite
* delete old manual and script plugins
* manually specify we want chall.token
* use consistent quotes
* specify chall for uri
* s/script/hook
* fix spacing on instructions
* remove unneeded response argument
* make achall more helpful
* simplify perform
* remove old test files
* add start of manual_tests
* fix ParseTest.test_help
* stop using manual_test_mode in cli tests
* Revert "make achall more helpful"
This reverts commit 54b01cea30.
* use bad response/validation methods on achalls
* simplify perform and cleanup environment
* finish manual tests
* Add HTTP manual hook integration test
* add manual http scripts
* Add manual DNS script integration test
* remove references to the script plugin
* they're hooks, not scripts
* add --manual-public-ip-logging-ok to integration tests
* use --pref-chall for dns integration
* does dns work?
* validate hooks
* test hook validation
* Revert "does dns work?"
This reverts commit 1224cc2961.
* busy wait in manual-http-auth
* remove DNS script test for now
* Fix challenge prefix and add trailing .
* Add comment about universal_newlines
* Fix typo from 0464ba2c4
* fix nits and typos
* Generalize HookCOmmandNotFound error
* Add verify_exe_exists
* Don't duplicate code in hooks.py
* Revert changes to hooks.py
* Use consistent hook error messages
* CLI flag for forcing interactivity
* add --force-interactive
* Add force_interactive error checking and tests
* Add force_interactive parameter to FileDisplay
* add _can_interact
* Add _return_default
* Add **unused_kwargs to NoninteractiveDisplay
* improve _return_default assertion
* Change IDisplay calls and write tests
* Document force_interactive in interfaces.py
* Don't force_interactive with a new prompt
* Warn when skipping an interaction for the first time
* add specific logger.debug message
* Begin fixing incorrect defaults
* Fix more defaults
* Make more defaults correct
* Update cli-help.txt
(To show what this PR does)
* Lint
* Extend argparse rather than vendoring it
* lint
* Move sample User Agent generation into the same module as UA generation
* Revert cli-help.txt to previous release version
* Slightly more consistent linebreaks
