add launchpad bug reports without comments

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+"Image format was not specified" warning should be suppressed for the vvfat (and probably nbd) driver
+
+Running
+
+qemu -drive file.driver=vvfat,file.dir=.
+
+displays
+
+WARNING: Image format was not specified for 'json:{"dir": ".", "driver": "vvfat"}' and probing guessed raw.
+         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
+         Specify the 'raw' format explicitly to remove the restrictions.
+
+However, since "images" provided by the vvfat driver are always raw (and the first sector isn't writeable in any case), this warning is superfluous and should not be displayed.
+
+A similar warning is displayed for NBD devices; I suspect it should be also disabled for similar reasons, but I'm not sure if serving non-raw images is actually a violation of the protocol. qemu-nbd translates them to raw images, for what it's worth, even if it may be suppressed with -f raw.
+
+Noticed on 2.3.0; the code that causes this behaviour is still apparently present in today's git master (f3a1b5068cea303a55e2a21a97e66d057eaae638). Speaking of versions: you may want to update the copyright notice that qemu -version displays.
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