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In some cases a chain could change from stale to active, but once it's added to staleChains it would always be deleted once. When the proxier tries to delete a previously stale but currently active chain, it would fail and lead to errors, though it won't cause real problem thanks to kernel's validation. The commit removes a chain from staleChains if it becomes active. Signed-off-by: Quan Tian <qtian@vmware.com>