Merge changes from topic "am-2e62287de9d64a8d9d3aba7f81c8e5cf"

* changes:
  Merge changes from topic "multipath-datausage-backport" am: df984fae26 am: c46c21c702 am: ce9b009827  -s ours
  Add metered, roaming, and defaultNetwork info to NetworkTemplate. am: 0f9bce6883 am: e383807d7f am: f5c668bf38  -s ours
  Unbreak frameworks-net tests broken by missing libutilscallstack. am: f7fab104f9 am: df4aba36b4 am: 333eb0ee46  -s ours
  Disable IpConnectivityMetricsTest. am: b7a479c293 am: afb4ba1c35 am: 2d1c6405d6  -s ours
  Add the defaultNetwork element to the netstats.proto. am: 9781f785bc am: adcb94472a am: 5d50149710  -s ours
  Add getDefaultNetwork to the NetworkStats public API. am: d5876bc438 am: 66eab17abc am: 424fbdbd1e  -s ours