Adding Network Tethering Metrics/atoms in the statsd

Test: Run statsd_testdrive
Bug: 15192618
Change-Id: Ia0dc1dd45e006348c3856b483972a4ccd6048d05
Merged-In: Ia0dc1dd45e006348c3856b483972a4ccd6048d05
(cherry picked from commit 8abf3a7c23976340179e109e1b3a009737414bd1)
3 files changed