tests: Ensure routes are not queued when calling verify_rib

Lots of tests call verify_rib that takes a list of routes that
need to be verified in some fashion.  This verify_rib functionality
will try up to 12 seconds before failing the check that zebra
has the route and has installed it.

Unfortunately the verify_rib code was not looking to see if
the route was queued for installation and was then allowing
tests to immediately do subsuquent steps that depended on
that route actually being installed sometimes causing tests
to fail.

Write a bit of additional code that looks at the queued
status and allows the test to wait a bit longer for zebra
to finish processing before allowing the test to move on
to the next bit.

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

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