Fix compiler warnings about missing switch cases

Add missing case statements to fix all the remaining compiler
warnings.

Change-Id: Ia804df28317d4291e1e9e9a42f1e62e60b02f5e2

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/ShowCaches.java

@@ -250,6 +250,10 @@ final class ShowCaches extends CacheCommand {
         case RUNNING: tasksRunning++; break;
         case READY: tasksReady++; break;
         case SLEEPING: tasksSleeping++; break;
+        case CANCELLED:
+        case DONE:
+        case OTHER:
+          break;
       }
     }
     stdout.format(