Remove local server restriction in unit tests config

Unit tests still won't be able to fire up a local server for other
reasons, but it is reasonable to at least allow URLs to be constructed
from within tests so as to be able to make assertions about
conditions that would allow connections to be made successfully.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=146917889

java/google/registry/config/files/nomulus-config-unittest.yaml

@@ -1,12 +1,6 @@
 # This is the configuration file used by unit tests. These values ARE NOT
 # SUITABLE for use in a real deployed environment.
 
-appEngine:
-  # Tests can't fire up a full server, so make them error out if they try to.
-  toolsServiceUrl:
-    hostName: null
-    port: 0
-
 registryPolicy:
   registrarChangesNotificationEmailAddresses:
     - notification@test.example