Use keyword args to be consistent

Author: will-gant

lib/diego/client.rb

@@ -187,7 +187,7 @@ def active_bbs_url
 
     def active_bbs_id
       tries ||= 3
-      locket_client.fetch('bbs').resource.owner
+      locket_client.fetch(key: 'bbs').resource.owner
     rescue GRPC::BadStatus => e
       retry unless (tries -= 1).zero?
       raise e

lib/locket/client.rb

@@ -19,7 +19,7 @@ def initialize(host:, port:, client_ca_path:, client_cert_path:, client_key_path
       @lock_acquired = false
     end
 
-    def fetch(key)
+    def fetch(key:)
       service.fetch(build_fetch_request(key))
     end