Fix ensure_provider_tests.py so that the tests are correctly generated.
Because the generated tests have not been checked in a while, there was
some drift between the actual tests and what should have been generated,
so the new generated tests have also been included.
When `ensure_provider_tests.py` detects differences, it will now show
the diffs using a unified diff format.
Added a new tox testenv `ensure_provider_tests` - use
`tox -e ensure_provider_tests` to run - to pass arguments, use
`tox -e ensure_provider_tests -- generate`
Added `ensure_provider_tests` as one of the tox testenvs to run for
github tox CI.
Signed-off-by: Rich Megginson <rmeggins@redhat.com>
