[automerge] Avoid going over max service name length when renaming NSD services 2p: 34b5eeae9f am: 5572568b81 am: 09f78a03e4

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23023746

Change-Id: I20658a52660fea160975ff792aafcc233e9255a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>