include job shard in process name for worker

test plan:
 * run delayed jobs
 * using `ps aux | grep delay` confirm that the worker's
   shard id is included in the wait (likely 1)
 * in console, do `Kernel.send_later(:sleep, 60)`
 * using `ps aux | grep delay` confirm that the job's
   shard id is included (likely 1)

Change-Id: I4ef23c5fba72ae72441ba40e5890d5678a8223c3
Reviewed-on: https://gerrit.instructure.com/40210
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>
QA-Review: August Thornton <august@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>

vendor/plugins/delayed_job/lib/delayed/worker.rb

@@ -136,7 +136,7 @@ class Worker
         end
       end
     else
-      set_process_name("wait:#{@queue}:#{min_priority || 0}:#{max_priority || 'max'}")
+      set_process_name("wait:#{Shard.current(:delayed_jobs).id}~#{@queue}:#{min_priority || 0}:#{max_priority || 'max'}")
       sleep(sleep_delay + (rand * sleep_delay_stagger))
     end
   end
@@ -144,7 +144,7 @@ class Worker
   def perform(job)
     count = 1
     self.class.lifecycle.run_callbacks(:perform, self, job) do
-      set_process_name("run:#{job.id}:#{job.name}")
+      set_process_name("run:#{Shard.current(:delayed_jobs).id}~#{job.id}:#{job.name}")
       say("Processing #{log_job(job, :long)}", :info)
       runtime = Benchmark.realtime do
         if job.batch?