Improve dumping IPv4 map entries.

1. Dump both upstream and downstream rules.
2. Also dump rule last used time.

Test: manual
Bug: 190783768
Original-Change: https://android-review.googlesource.com/1737394
Merged-In: I3fffbf4a5dea68e61349de8b41bea49b8a319f86
Change-Id: I3fffbf4a5dea68e61349de8b41bea49b8a319f86
1 file changed