add launchpad bug reports without comments

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+support vhost user without specifying vhostforce
+
+[Impact]
+
+ * vhost-user falls back to virtio-net which causes performance lose without specifying the vhostforce option. But it should be the default behavior for vhost-user, since guests using PMD doesn't support msi-x.
+
+[Test Case]
+
+  create a vhost-user virtio backend without specifying the vhostforce option, i.e. -netdev type=vhost-user,id=mynet1,chardev=<char_dev_for_the_controll_channel>
+  start the VM
+  vhost-user is not enabled
+
+[Regression Potential]
+
+ * none
+
+vhost user nic doesn't support non msi guests(like pxe stage) by default.
+Vhost user nic can't fall back to qemu like normal vhost net nic does. So we should
+enable it for non msi guests.
+
+The problem has been fix in qemu upstream  - http://git.qemu.org/?p=qemu.git;a=commitdiff;h=24f938a682d934b133863eb421aac33592f7a09e. And the patch needs to be backported to 1:2.2+dfsg-5expubuntu9.8 .
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