GRN-80: Allow local accounts on multitenant (#428)

* Changed the way the omniauth providers are declared

* Allow local authentication for multitenant mode based on customer settings

* Cleanead up code mandated by rubocop

* Completed implementation for signin and added the one for signup

* Fixed issue with rubocop

* Renamed customer_name to lb_user

* Renamed lb_user -> user_domain, fixed issue with signup controller, email verification WAS NOT implemented

* Completed implementation of email_verification

* Fixed rubocop issue

* Final update

* Fix for test with loadbalancer

* Make sure loadbalancer mockup is only used when env defined

* Fix for test on rooms_controller

* Fixed most of the test failing on multitenant env

* Fixed issue detected by rubocop

* Fixed issue with activation tockens not working on resend

* Fixed new issue found by rubocop

* Updated travis script

* Harcoded credentials for mockup

* Updated expectation on start_session

* Fixed issue with duplication of home room

* Updated script for rubocop

* Restored Gemfile

config/locales/en.yml

@@ -77,6 +77,7 @@ en:
       signout: Sign out
   home_room: Home Room
   info_update_success: Information successfully updated.
+  invalid_user: Login failed due to user not found. Are you sure the email account is correct?
   invalid_credentials: Login failed due to invalid credentials. Are you sure you entered them correctly?
   invalid_login_method: Login failed due to account mismatch. You need to log in with omniauth.
   invite_message: "To invite someone to the meeting, send them this link:"