routing: add IPv6 fib validation procedure.

Allow consistency validation of the inet6 fib based on rib data.
Validation can be kicked off by loading test_lookup module and
running sysctl net.route.

routing: add IPv6 fib validation procedure.

Allow consistency validation of the inet6 fib based on rib data.
Validation can be kicked off by loading test_lookup module and
running sysctl net.route.test.run_inet6_scan=1

(cherry picked from commit cbfba56c45ab77303a3e25a82cf750043849760b)

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routing: Use process fib instead of fib 0 when conducting tests.

* Allow to do validation/performance tests by using process
fib instead of default fib 0.
* Print all validation errors instead of j

routing: Use process fib instead of fib 0 when conducting tests.

* Allow to do validation/performance tests by using process
fib instead of default fib 0.
* Print all validation errors instead of just the first one.

(cherry picked from commit 4a77a9b6491093b9a8bb786a861ed74ddf156e8e)

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