cq.cfg: use luci.infra.try bucket

config/cq.cfg

 # See http://luci-config.appspot.com/schemas/projects/refs:cq.cfg for the
 # documentation of this file format.
 
 version: 1
 cq_name: "infra"
 cq_status_url: "https://chromium-cq-status.appspot.com"
 git_repo_url: "https://chromium.googlesource.com/infra/infra.git"
 
 rietveld {
   url: "https://codereview.chromium.org"
@@ skipping 23 matching lines @@
       builders {
         name: "infra_mac"
         experiment_percentage: 100
       }
       builders {
         name: "infra_win"
         experiment_percentage: 100
       }
     }
     buckets {
-      name: "master.tryserver.infra",
+      name: "luci.infra.try",
       builders {name: "Infra Presubmit"}
-      builders {name: "Infra Presubmit (Swarming)"}
       builders {name: "Infra Linux Trusty 64 Tester"}
-      builders {name: "Infra Linux Trusty 64 Tester (Swarming)"}
       builders {name: "Infra Linux Precise 32 Tester"}
-      builders {name: "Infra Linux Precise 32 Tester (Swarming)"}
       builders {name: "Infra Mac Tester"}
-      builders {name: "Infra Mac Tester (Swarming)"}
       builders {name: "Infra Win Tester"}
-      builders {name: "Infra Win Tester (Swarming)"}
     }
   }
   sign_cla {}
 }