Add a test for NetworkIdentity.getMetered() am: eaca5b1982 am: 1d79f3dd99 am: bcbe8122e9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1779526

Change-Id: I56090ea3a2f514863e0cf3f2bb0b011cec580aea