Initialize callbacks in fuzzer am: 857ece4f am: 68de805a am: a2af062b...

Initialize callbacks in fuzzer am: 857ece4f am: 68de805a am: a2af062b am: d7a666d3 am: a4b2e236 am: 17ade966

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2469762



Change-Id: I8905d6cbdfd44488a1ad7169776819e38a6d6c1d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>