update unit test coverage

Author: aojea

keps/sig-network/3070-reserved-service-ip-range/README.md

@@ -281,6 +281,8 @@ type randomScanReservedStrategy struct {
 This feature doesn't modify the cluster behavior, only the order on which dynamic IP are assigned to Services,
 there is no need for e2e or integration tests, unit tests are enough.
 
+- pkg/registry/core/service/allocator/bitmap_test.go - 84.2
+- pkg/registry/core/service/ipallocator/allocator_test.go - 87
 ### Graduation Criteria
 
 #### Alpha