add launchpad bug reports without comments

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+qemu-nbd -r -c taints device for subsequent usage, even after -d
+
+Something about qemu-nbd -r -c /dev/nbd0 someimg leaves cruft behind - subsequent connections get marked readonly.
+
+This is on quantal, haven't checked precise or raring.
+
+To demonstrate:
+# use one image
+qemu-img create -f qcow2 /tmp/1.qcow2 100M
+sudo qemu-nbd -c /dev/nbd2 /tmp/1.qcow2
+sudo mkfs -t ext4 /dev/nbd2
+sudo qemu-nbd -d /dev/nbd2
+# use a second one on the same nbd device, shows that reuse works:
+qemu-img create -f qcow2 /tmp/2.qcow2 100M
+sudo qemu-nbd -c /dev/nbd2 /tmp/2.qcow2
+sudo mkfs -t ext4 /dev/nbd2
+sudo qemu-nbd -d /dev/nbd2
+# connect an image in read only mode
+sudo qemu-nbd -r -c /dev/nbd2 /tmp/2.qcow2
+sudo dumpe2fs /dev/nbd2 | head -n 3
+sudo qemu-nbd -d /dev/nbd2
+# now try to reuse in read-write mode again:
+qemu-img create -f qcow2 /tmp/3.qcow2 100M
+sudo qemu-nbd -c /dev/nbd2 /tmp/3.qcow2
+sudo mkfs -t ext4 /dev/nbd2
+# here it goes boom:
+mke2fs 1.42.5 (29-Jul-2012)
+/dev/nbd2: Operation not permitted while setting up superblock
+# still need to cleanup
+sudo qemu-nbd -d /dev/nbd2
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