iptables: don't log command probe failures
Commit b9dd878f caused a regression in iptables interaction by logging non-zero status at a higher level than VIR_INFO. Revert that portion of the commit, as well as adding a comment explaining why we check the status ourselves. Reported by Nehal J Wani. * src/util/viriptables.c (virIpTablesOnceInit): Undo log regression. Signed-off-by: NEric Blake <eblake@redhat.com>
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