Fix flaky ConnectivityServiceTest#testNetworkFactoryUnregister

Test: atest ConnectivityServiceTest#testNetworkFactoryUnregister \
      --geneate-new-metrics 100
Bug: 151792032
Change-Id: Iece9e8ad5c51170cd404ac995d0005392d37fe0c
1 file changed
tree: 25ca233d1dffa3b4bee08f7b4e8a70cecdeb9c68
  1. core/
  2. services/
  3. tests/