* Add latest updates from FTD Ansible downstream repository.
- add a better implementation of the upsert operation;
- add API version lookup functionality;
- add filter which remove duplicated references from the list of references;
- fix minor bugs.
* fix issues outlined by ansibot
* fix argument name for _check_enum_method
* FTD modules: bug fixes and upsert functionality
* Fix sanity checks
* Fix unit tests for Python 2.6
* Log status code for login/logout
* Use string formatting in logging
* Add common and Swagger client utils for FTD modules
* Update FTD HTTP API plugin and add unit tests for it
* Add configuration layer handling object idempotency
* Add ftd_configuration module with unit tests
* Add ftd_file_download and ftd_file_upload modules with unit tests
* Validate operation data and parameters
* Fix ansible-doc, boilerplate and import errors
* Fix pip8 sanity errors
* Update object comparison to work recursively
* Add copyright
