Why is this necessary? Several examples below. - When a route sets prefsrc, then the address must be already assigned (see issue #19285), and also it must be ready if IPv6. - When a route or nexthop sets gateway, then the address must be reachable. - When a route sets nexthop ID, then the corresponding nexthop must be assigned. - When a route sets multipath routes on another interface, then the interface must exist and be ready to configure. - When configuring address, the same address must not be under removing (see issue #18108). Etc,. etc,... So, this makes all requests about addresses, routes, and nethops are once stored in the queue, and will be processed when they are ready to configure. Fixes #18108 and #19285.
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