* Update samples
./bin/php-petstore.sh
* Remove unnecessary implements entry
ModelInterface, ArrayAccess are already implemented in parent
* Remove field `container` which is already defined in parent
* Change snake case to lower camel case
- invalid_properties
- allowed_values
* Improve doc commenct style
* Improve description length
* Improve length
* Doc comment short description must start with a capital letter
* Add a line between @param and @return
* Delete an additinal blank line at end of doc comment
* Udpate petstore-security-test