add launchpad bug reports without comments

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+qemu is very slow when adding 16,384 virtio-scsi drives
+
+qemu runs very slowly when adding many virtio-scsi drives.  I have attached a small reproducer shell script which demonstrates this.
+
+Using perf shows the following stack trace taking all the time:
+
+    72.42%    71.15%  qemu-system-x86  qemu-system-x86_64       [.] drive_get
+            |          
+             --72.32%--drive_get
+                       |          
+                        --1.24%--__irqentry_text_start
+                                  |          
+                                   --1.22%--smp_apic_timer_interrupt
+                                             |          
+                                              --1.00%--local_apic_timer_interrupt
+                                                        |          
+                                                         --1.00%--hrtimer_interrupt
+                                                                   |          
+                                                                    --0.83%--__hrtimer_run_queues
+                                                                              |          
+                                                                               --0.64%--tick_sched_timer
+
+    21.70%    21.34%  qemu-system-x86  qemu-system-x86_64       [.] blk_legacy_dinfo
+            |
+            ---blk_legacy_dinfo
+
+     3.65%     3.59%  qemu-system-x86  qemu-system-x86_64       [.] blk_next
+            |
+            ---blk_next
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