base

Avoid overlapping NetIDs in ConnectivityServiceTest with real NetIDs

Overlapping the NetIDs can cause the ConnectivityService instance under test
to inadvertently use real networks, for example when NetworkMonitor attempts
to validate a network.  This fixes test hangs when run on devices with
active internet connections.

Change-Id: I5e1898953f0117b9f75beccac4a52ae2db173567