qemu: correct misspelled 'enospc' option, and only use for werror
This resolves: https://bugzilla.redhat.com/show_bug.cgi?id=730909 When support for setting the qemu disk error policy to "enospc" was added, it was inadvertently spelled "enospace". This patch corrects that on the qemu commandline (while retaining the "enospace" spelling for libvirt's XML). Also, while examining the qemu source, I found that "enospc" is not allowed for the read error policy, only for write error policy (makes sense). Since libvirt currently only has a single error policy setting, when "enospace" is selected, the read error policy is set to "ignore".
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