Clean up the switch state machine.

Handle inputs while in any state.  This is made much easier by removing
the synchronous calls - any time you find a synchronous call into a state
machine you're doing something wrong.

Also rework the timeout system - it was bad in that it injected the
new session id whenever you start an new session so old timers were
always acted upon.

Also should eliminate/reduce the duplicate ALLOW_DATA RIL calls.

bug:20076867
Change-Id: Ibabd76fad0759dd9c403ac8ee017958e38df56a5