[Bug 1850779] [NEW] [L3] snat-ns will be initialized twice for DVR+HA routers during agent restart

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If the  DVR+HA router has external gateway, the snat-namespace will be initialized twice during agent restart.
And that initialized function will run many [1][2] external resource processing actions which will definitely increase the starting time of agent.

https://github.com/openstack/neutron/blob/master/neutron/agent/l3/dvr_snat_ns.py#L31-L39
https://github.com/openstack/neutron/blob/master/neutron/agent/l3/namespaces.py#L91-L108

** Affects: neutron
     Importance: Medium
     Assignee: LIU Yulong (dragon889)
         Status: Fix Released

** Affects: neutron (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: in-stable-pike in-stable-queens in-stable-rocky in-stable-stein in-stable-train l3-dvr-backlog l3-ha
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[L3] snat-ns will be initialized twice for DVR+HA routers during agent restart
https://bugs.launchpad.net/bugs/1850779
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