Merge changes from topic 'android-lowpan-next'

* changes:
  lowpan: AIDL refactor to no longer use property design pattern
  LowpanException: Refactor exception handling
  lowpan: Introduce new unit tests for data classes
  lowpan: Make various data classes Parcelable
  lowpan: Remove libandroid_net_lowpan from platform/frameworks/base
  LowpanEnergyScanResult: Remove `public` designation from setChannel/setMaxRssi