Publish FOREGROUND and add NOT_SUSPENDED capabilities.

NOT_SUSPENDED and FOREGROUND are capabilities that need to
be public so as to reach feature parity with what information
can be gotten through the use of CONNECTIVITY_ACTION and
synchronous calls to ConnectivityManager. This change makes
them public, and wires up the NOT_SUSPENDED capability.
This deprecates in effect the old onSuspended and onResumed
callbacks, but these have never been public.

This also converts the onAvailable path from a multiple
binder call design to a simpler, single binder call. This
is only for internal convenience

Test: runtest frameworks-net
Test: cts
Test: also manual testing
Change-Id: I6ea524bb361ecef0569ea2f9006c1e516378bc25