revert changes to integration test env resources

Author: David O'Sullivan

ci/tcp-routes.yml

@@ -18,13 +18,10 @@
 - type: replace
   path: /resource-config/tcp_router/instances
   value: automatic
+- type: replace
+  path: /resource-config/compute/instances
+  value: 2
 - type: replace
   path: /product-properties/.cloud_controller.default_quota_memory_limit_mb
   value:
     value: ((DEFAULT_QUOTA_MEM_MB))
-- type: replace
-  path: /resource-config/compute/instances
-  value: 4
-- type: replace
-  path: /resource-config/compute/instance_type/id
-  value: "2xlarge.mem"