config(github oauth): removed allowed_domains options, closes #1986

conf/defaults.ini

@@ -153,7 +153,6 @@ auth_url = https://github.com/login/oauth/authorize
 token_url = https://github.com/login/oauth/access_token
 api_url = https://api.github.com/user
 team_ids =
-allowed_domains =
 allowed_organizations =
 
 #################################### Google Auth ##########################

conf/sample.ini

@@ -152,7 +152,6 @@
 ;token_url = https://github.com/login/oauth/access_token
 ;api_url = https://api.github.com/user
 ;team_ids =
-;allowed_domains =
 ;allowed_organizations =
 
 #################################### Google Auth ##########################