Refactors common scope id setup code into utility function

Bug: 279691947
Test: atest NetworkStackIntegrationTests NetworkStackRootTests
Test: atest CtsNetTestCases:android.net.cts.NsdManagerTest
(cherry picked from https://android-review.googlesource.com/q/commit:a6a6ff93b2a390cfda314a1b8b495a257af85efb)
Merged-In: I5627037c95b5b9cf4af46018bccffb4f16b402a8
Change-Id: I5627037c95b5b9cf4af46018bccffb4f16b402a8
1 file changed