Once MDL-54857 lands, will be able to improve the way we check a new site that wants to be added.

Instead doing the initial check against login/token, we can check via AJAX the response of tool_mobile_get_public_config, from there we'll be able to retrieve the correct site settings, like the URL and get others important public settings (like the SSO support). This will allow us to:

• Detect if mobile services are enabled or not
• Detect if the sites is using SSO or not
• Add the site full name in the credentials screen
• Handle site maintenance status