network statistic data and metrics collection

Collect network DNS statistic data by statsd

Test: run runtests.sh, make sure no missing test and get all pass
      run /out/host/linux-x86/bin/statsd_testdrive 116
      Got following metric data dump:pass for local test
Bug: 119862317

Change-Id: I29b85128cad1b3ed3100120317e171172f472bb5