Deprecate static ConnectivityManager.get/setProcessDefaultNetwork() functions.

These functions risk hitting an unchecked Exception due to ConnectivityManager
not being instantiated yet.  Also, change Network.openConnection() to throw a
checked Exception rather than an unchecked Exception when ConnectivityManager
is not yet instantiated.

bug:19416463
Change-Id: Ie1e2b3238aec0343d267c76b64927073f2f05f85
9 files changed