btservice: Add ProfileServiceTest

Start and stop all configured profiles on a platform.  Add some small
variations on the theme (interleave, start and stop multiple times...)

Bug: 67460963
Test: runtest -j20 bluetooth 
         -c com.android.bluetooth.btservice.ProfileServiceTest
Change-Id: Ice0e23f58b87302cd8862ee80c4083b37d91af20