* ensure exit_json does not fail from stderr=False
- do a little bit of safety-checking in exit_json to not try to .splitlines() on a boolean
- remove the stderr=boolean from uri.py, this is the only spot that uses it (at least so obviously)
- add unit tests that call exit_json. These are useless because the stderr parsing is in _execute_module and is difficult to mock; deleting these tests after the commit.
* remove added unit tests per prev commit
exit_json doesn't do the param parsing, that is buried deep inside _execute_module.
887456ab8e