Fix flaky ConnectivityServiceTest#testNetworkFactoryUnregister

Test: atest ConnectivityServiceTest#testNetworkFactoryUnregister \
      --geneate-new-metrics 100
Bug: 151792032

Change-Id: I1ee7a26186885d3a79a32ec9e45f5bcd656a6680
Merged-In: I1ee7a26186885d3a79a32ec9e45f5bcd656a6680
Merged-In: Iece9e8ad5c51170cd404ac995d0005392d37fe0c
(cherry picked from commit 31c26cdbeb35a6fd6a53a1c25cce6d36b825bf41)
1 file changed