Move NetworkStatsIntegrationTest from NetworkStack to Connectivity

Change package from android.net to com.android.server.net.integration,
and fix imported package dependency.

Bug: 322113686
Test: atest FrameworksNetIntegrationTests:com.android.server.net.integrationtests.NetworkStatsIntegrationTest
Change-Id: Id3c497f3b828d2cf85653d40253502565a1e8568
2 files changed