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Ensure dnsmasq accept rules are preset at startup.
Fix bug 1000853. This bug reported that after restarting nova-network, the dnsmasq ACCEPT iptables rules were no longer present, causing instances to lose their IP addresses. This patch updates the restart_dhcp() function in the linux_net driver to ensure these rules are present even if dnsmasq was already running. Before this was only done when first starting dnsmasq. Change-Id: Icfbe6177d4c913c3d7755ca40a71752bcdaa4448
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good job~