virNetDevOpenvswitchInterfaceStats: Be more forgiving when fetching stats
https://bugzilla.redhat.com/show_bug.cgi?id=1461270 When fetching stats for a vhost-user type of interface, we run couple of ovs-vsctl commands and parse their output. However, not all stats exist at all times, for instance "rx_dropped" or "tx_errors" can be missing. Thing is, we ask for a bulk of statistics and if one of them is missing an error is reported instead of returning the rest. Since we ignore errors, we fail to set statistics. Fix this by asking for each piece alone. Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
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