Add extra seat check in the user API call and turn off user->org conversion when authentication is LDAP

endpoints/api/user.py

@@ -229,7 +229,12 @@ def conduct_signin(username_or_email, password):
   needs_email_verification = False
   invalid_credentials = False
 
-  verified = authentication.verify_user(username_or_email, password)
+  verified = None
+  try:
+    verified = authentication.verify_user(username_or_email, password)
+  except model.TooManyUsersException as ex:
+    raise license_error(exception=ex)
+
   if verified:
     if common_login(verified):
       return {'success': True}
@@ -247,6 +252,7 @@ def conduct_signin(username_or_email, password):
 
 @resource('/v1/user/convert')
 @internal_only
+@show_if(app.config['AUTHENTICATION_TYPE'] == 'Database')
 class ConvertToOrganization(ApiResource):
   """ Operations for converting a user to an organization. """
   schemas = {