some bt test util methods are useful as device setup util, this
change exposes some of them via a BluetoothInstrumentation so
that they can be invoked like commands for setting up or
controlling bt state in test harness
Change-Id: I1d40baf374e145ab550ae4fa5f581e2eaf2e29bb
Move connect / disconnect / set and get priority
functions down the interface as they are not generic enough
for all profiles.
Change-Id: I2656e1bdbc8046c53bb0dfbd9172f5f10b57aa7d
