Re: [libvirt] [PATCH] qemu: parse -device virtio-balloon

There are no options to parse here, and all three possible device names have the same prefix ("virtio-balloon" with "-ccw", "-pci", or "-device" appended), so it is fairly simple. qemuParseCommandLineString() previously would always add a <memballoon model='virtio'/> to every result (the comments erroneously say that it is adding a <memballoon model='none'/>) This has been changed to add model='none', and 84 test case xml's updated accordingly (so that qemuxml2argvtest won't fail). Now that the memballoon device is properly parsed, we can safely add a test for properly ignoring -nodefconfig and -nodefaults. Rather than adding an entire new test case for this (and memballoon), we just randomly pick the clock-utc test and modify it slightly to fulfill the purpose.

--- I don't necessarily have any love for the memory balloon driver, but this ended up being necessary in order to prevent test failures after fixing the patch here to not ignore unrecognized -device args: https://www.redhat.com/archives/libvir-list/2014-June/msg00388.html