Decouple GeoNode factory from config

Also, the port sequence did not seem to have any effect.

ee/spec/factories/geo_nodes.rb

 FactoryBot.define do
   factory :geo_node do
-    # Start at a number higher than the current port to avoid the GeoNode
-    # "lock out" validation
-    sequence(:url, Gitlab.config.gitlab.port + 1) do |port|
-      uri = URI.parse("http://#{Gitlab.config.gitlab.host}:#{Gitlab.config.gitlab.relative_url_root}")
-      uri.port = port
-      uri.path += '/' unless uri.path.end_with?('/')
+    sequence(:url) do |n|
+      "http://node#{n}.example.com/gitlab"
+    end
 
-      uri.to_s
+    sequence(:name) do |n|
+      "node_name_#{n}"
     end
-    name { url }
 
     primary false
 
     trait :primary do
       primary true
       minimum_reverification_interval 7
-
-      url do
-        uri = URI.parse("http://#{Gitlab.config.gitlab.host}:#{Gitlab.config.gitlab.relative_url_root}")
-        uri.port = Gitlab.config.gitlab.port
-        uri.path += '/' unless uri.path.end_with?('/')
-
-        uri.to_s
-      end
     end
   end
 end