Merge changes from topic "multipath-datausage-backport"

* changes:
  Support passing a template to NetworkStatsManager queries.
  Add metered, roaming, and defaultNetwork info to NetworkTemplate.
  Unbreak frameworks-net tests broken by missing libutilscallstack.
  Disable IpConnectivityMetricsTest.
  Add the defaultNetwork element to the netstats.proto.
  Add getDefaultNetwork to the NetworkStats public API.