Depend on okcomputer-like behavior in dor-fetcher-service

.travis.yml

@@ -2,10 +2,4 @@ sudo: false
 language: ruby
 script: rake rspec
 rvm:
-  - 2.3.1
-  - 2.2.2
-  - 2.1.2
-notifications:
-  email:
-    - pmangiafico@stanford.edu
-    - laneymcg@stanford.edu
+  - 2.5.3

lib/dor-fetcher.rb

@@ -35,7 +35,7 @@ def service_info
     # @return [Boolean] True for a service that responds, False for a service that does not.
     def is_alive?
       resp = @site.get
-      200.eql?(resp.code) && 'ok'.eql?(resp)
+      200.eql?(resp.code) && /PASSED/.match?(resp.body)
     end
 
     # Get a hash of all members of a collection and the collection itself