network_xml:Update to support setting up hostname xmls with a list of hostname strings #4014
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Then we can directly use the values getting from a netxml.hostnames to set
the value of netxml.hostnames without having to convert it from a list
of dicts to a list of strings.
Test result can be found here: autotest/tp-libvirt#5950
Tested with a case affected by this code change (from #3629)