qemu: Fix -chardev udp if parameters are omitted
The following XML: <serial type='udp'> <source mode='connect' service='9999'/> </serial> is accepted by domain_conf.c but maps to the qemu command line: -chardev udp,host=127.0.0.1,port=2222,localaddr=(null),localport=(null) qemu can cope with everything omitting except the connection port, which seems to also be the intent of domain_conf validation, so let's not generate bogus command lines for that case. The defaults are empty strings for addresses and 0 for the localport Additionally, tweak the qemu cli parsing to handle omitted host parameters for -serial udp
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