Specifically:
[1] provide a hasIPv4(), and
[2] a hasIPv6()
each of which requires an IP address, a default route, and
address-family-specific DNS servers to evaluate to true.
Additionally:
[3] redefine isProvisioned() to return the logical OR
of [1] and [2] above.
Any external caller can still use any of the has*() methods to
construct its own, different definition of "provisioned".
Bug: 17769720
Change-Id: Ia692fb8508484ff403d3920c94d0e1db4563f807
8b02307fd5