fixes #5812 - url parameter in compute_resource#create is not required for EC2, removing the required flag

Fixes #9113 - api docs for users miss locale and timestamp params

Locale was missing also in the server responses.

fixes #9030 - Adds support to clone config template via api

Fixes #9225 - private is defined twice in hosts controller

Fixes #8838 - Replace HTTP error codes with human-readable symbols

fixes #8484 - make SmartProxyAuth concern more useful to plugins

fixes #8049 - Add timezone to user

fixes #8627 - add host comment field to API documentation

fixes #8228 - add a config_templates concern to serve config_templates controllers

Fixes #8284 - missing params in OS api docs