zebra: Make connected routes their own entry on the meta_q

During quick ifdown / ifup events from the linux kernel there
exists a situation where a prefix that has both a kernel route
and a static route can queued up on the meta-q.  If the static
route happens to point at a connected route for nexthop resolution
and we receive a series of quick up/down events *after* the
static route and kernel route are queued up for rib reprocessing.
Since the static route and kernel route are queued on meta-q 1
and the connected route is also on meta-q 1 there exists a situation
where the connected route will be resolved after the static route
fails to resolve, leaving the static route in a unresolved state.

Add a new queue level and put connected routes on their own level,
since they are the fundamental building blocks of pretty much
all the other routes.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

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