Verify MACs on blockage_migration test

src/proto/blockage_migration.rs

@@ -187,6 +187,8 @@ mod tests {
         let lox_cred_3 = th.level_up(rng, lox_cred_2.clone());
         th.block_bridges(lox_cred_3.clone());
         mig_cred = th.check_blockage(rng, lox_cred_3.clone());
+        th.verify_migration(&mig_cred.clone());
+        th.verify_lox(&lox_cred_3.clone());
         lox_cred = th.blockage_migration(rng, lox_cred_3.clone(), mig_cred.clone());
         th.verify_lox(&lox_cred);
     }