Implement A/B Test for using AWS as an executor for Java

lib/user_group_separator.rb

@@ -32,4 +32,16 @@ class UserGroupSeparator
         :no_community_solution
     end
   end
+
+  # Different user groups for using AWS lambda functions instead of Nomad based on the user_id
+  # This test is independent from any other A/B Test
+  def self.get_aws_group(user_id)
+    user_group = user_id % 2 # => 0, 1
+    case user_group
+      when 0
+        :no_aws
+      else # 1
+        :use_aws
+    end
+  end
 end