Changes to the metadata format were approved here:
https://github.com/ansible/proposals/issues/54
* Update documentation to the new metadata format
* Changes to metadata-tool to account for new metadata
* Add GPL license header
* Add upgrade subcommand to upgrade metadata version
* Change default metadata to the new format
* Fix exclusion of non-modules from the metadata report
* Fix ansible-doc for new module metadata
* Exclude metadata version from ansible-doc output
* Fix website docs generation for the new metadata
* Update metadata schema in valiate-modules test
* Update the metadata in all modules to the new version
* fix module doc fields
* More module docs corrections
* More module docs corrections
* More module docs corrections
* More module docs corrections
* correct aliases
* Review comments
* Must quote ':'
* More authors
* Use suboptions:
* restore type: bool
* type should be in the same place
* More tidyups
* authors
* Use suboptions
* revert
* remove duplicate author
* More issues post rebase
* Added the aix_inittab module to be able to modify the inittab at AIX systems.
* fixed identation errors
* fixed identations and trailing whitespace
changed if conditions
* repaired tab-identation
* adjusted to long line and identation
* Adjusted the yaml in the example documentation
* Adjusted the documentation yaml
* Repaired return yaml
* repaired typo
* Removed unnecessary parameters from comment
changed action to state, and changed the way to call this module
changed proccessaction to action
* adjusted result['warnings'] to module.warn()
* adjusted the documentation
* changed warning to failed
ran module against autopep8
* added check_mode
* fixed typo
* changed description and short description, to be able to push again after a failure at shippable