Default authentication, authentication without popup possible, split domain, restrict to authorized domains

Hi,

I've made a few changes in order to match my needs :

Added Azure AD provider in providers.json file
Added a configuration 'is_default' to specify that we want the provider to automatically try to login by default : if not authenticated, glpi will automatically try to authenticate you with the first provider that has the configuration is_default: true. If there is none, it will act as before, with the different authentication methods screen.
Added a configuration 'popup' to specify that we want the provider to login through a popup (current behavior) or in the current window.
Added a configuration 'split_domain' to specify that we want to match the provider login/mail with the glpi user identifier without taking into account the domain name from the provider login/name. IE: toto@outlook.com (provider being outlook) will match with the glpi user with the name "toto". If this configuration is false, it will act as before.
Added configuration 'authorized_domains' to restrict to authorized domain. IE: if authorized domains is '@outlook.com', and split_domain is true, glpi has a user with logon name "toto" ; toto@outlook.com will be able to login as toto, but toto@hotmail.com won't be able to sign in. Note: I take outlook and hotmail domains as an example, but concretly I use azure authentication where every tenant can connect with, so I wanted to be able to restrict which tenant can connect. Also, I want in a next version to be able to automatically create the user if not present (thus the need to restrict domains)

edgardmessias / glpi-singlesignon