feat(routing): scale down fib table concurrency test

The fibtable concurrency test takes more time than nearly all of
the tests, and can even take nearly a minute. Scale it down
to keep test run times low.

Signed-off-by: Fredi Raspall <fredi@githedgehog.com>

Author: Fredi-raspall

routing/src/fib/test.rs

@@ -247,8 +247,8 @@ mod tests {
     #[test]
     fn test_concurrency_fibtable() {
         // number of threads looking up fibtable
-        const NUM_WORKERS: u16 = 7;
-        const NUM_PACKETS: u64 = 1_000_000;
+        const NUM_WORKERS: u16 = 6;
+        const NUM_PACKETS: u64 = 1_000_00;
         const TENTH: u64 = NUM_PACKETS / 10;
 
         // create fibtable (empty, without any fib)